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GNOME 3.14 was released back in September and it includes some interesting changes like multi-touch gestures for both the system and applications, re-worked default theme, new animations as well as various enhancements for the code GNOME applications. More information HERE.

Unfortunately, Ubuntu GNOME 14.10 (Utopic Unicorn) ships with GNOME 3.12 for the most part (there are even some GNOME 3.10 packages, like Gedit or Nautilus) but, as usual, you can install the latest GNOME (3.14) by using a PPA.

• very large icons for some apps in Unity Dash and other places - screenshot;
• the default Ubuntu theme (Ambiance) doesn't work properly with some applications (screenshot) and Adwaita doesn't support Unity's CSS window decorations so you'll have to use a theme that supports GTK 3.14 and Unity, like Zukitwo, but even then you may encounter various issues like up/down arrows for indicators (screenshot);
• Nautilus, Totem and Gedit use client-side decorations and the default GNOME menu, so they will look out of place in Unity.

• on my laptop running Ubuntu 14.10, applications that use client-side decorations have a large shadow at the bottom (screenshot). This didn't occur in the two virtual machines I've tested the GNOME 3.14 installation under Ubuntu 14.10, but you may encounter this bug, and I didn't find out what's causing it;
• CSD applications have minimize and maximize buttons for some reason, even though GNOME doesn't use this by default - you can disable them via GNOME Tweak Tool  > Windows > Titlebar Buttons.

Install GNOME 3.14 in Ubuntu GNOME 14.10

sudo add-apt-repository ppa:gnome3-team/gnome3-staging
sudo add-apt-repository ppa:gnome3-team/gnome3
sudo apt-get update
sudo apt-get dist-upgrade

(gtk-update-icon-cache-3.0:29077): GdkPixbuf-WARNING **: Cannot open pixbuf loader module file '/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache': No such file or directory

This likely means that your installation is broken.
Try running the command
  gdk-pixbuf-query-loaders > /usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache
to make things work again for the time being.

sudo apt-get install libgdk-pixbuf2.0-dev

sudo -i
gdk-pixbuf-query-loaders > /usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache
exit

sudo -i
gdk-pixbuf-query-loaders > /usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache
exit

sudo apt-get install polari gnome-sound-recorder bijiben gnome-clocks gnome-music gnome-photos gnome-boxes

How to revert the changes

sudo apt-get install ppa-purge
sudo ppa-purge ppa:gnome3-team/gnome3
sudo ppa-purge ppa:gnome3-team/gnome3-staging

Install GNOME 3.12 in Fedora 20

su -
echo -e "[rhughes-f20-gnome-3-12-i386]\nname=Copr repo for f20-gnome-3-12 owned by rhughes (i386)\nbaseurl=http://copr-be.cloud.fedoraproject.org/results/rhughes/f20-gnome-3-12/fedora-\$releasever-i386/\nskip_if_unavailable=True\ngpgcheck=0\ncost=900\nenabled=1" > /etc/yum.repos.d/rhughes-f20-gnome-3-12.repo

su -
echo -e "[rhughes-f20-gnome-3-12-i386]\nname=Copr repo for f20-gnome-3-12 owned by rhughes (i386)\nbaseurl=http://copr-be.cloud.fedoraproject.org/results/rhughes/f20-gnome-3-12/fedora-\$releasever-i386/\nskip_if_unavailable=True\ngpgcheck=0\ncost=900\nenabled=1\n\n[rhughes-f20-gnome-3-12-x86_64]\nname=Copr repo for f20-gnome-3-12 owned by rhughes (x86_64)\nbaseurl=http://copr-be.cloud.fedoraproject.org/results/rhughes/f20-gnome-3-12/fedora-\$releasever-x86_64/\nskip_if_unavailable=True\ngpgcheck=0\ncost=800\nenabled=1" > /etc/yum.repos.d/rhughes-f20-gnome-3-12.repo

yum update

GNOME 3.12 video

GNOME 3.12: Changes in GNOME Shell, Settings, etc.

• Jumplists (also known as Quicklists in Unity) support;
• improved network menus;
• you can now create your own app folders from GNOME Software: go to the Installed view, select some applications and then choose which folder you want them to belong to;
• when searching the Activities Overview, GNOME Shell now displays applications available to install, along with installed apps;
• A geolocation indicator was added to the status menu;
• refined animations;
• window previews are now keyboard navigable.

• improved initial Setup Assistant
• better Wayland support
• Allow specifying monitor for OSD
• new Bluetooth settings
• GNOME Online accounts has better Facebook and Google support and also, it now supports Pocket (a web service that lets you save videos, articles and pretty much anything from the browser for later use)
• Google Cloud print support
• updated Adwaita GTK theme: new style for tabs and buttons, etc.

HiDPI

New bluetooth settings

Quickly toggle location on/off

Applications available for installation in the Activities Overview

New buttons style

New tabs style and popovers

GNOME 3.12 applications

Gedit

GNOME Software

GNOME Software

GNOME Software - manage software sources

• GNOME Software now displays application screenshots;
• automatic ratings which indicate the application quality;
• supports removing third-party repositories.

GNOME Videos (Totem)

GNOME Videos (Totem)

Polari

GNOME Sound Recorder

Web (Epiphany)

• Photos: Facebook integration, improved screenshot handling, performance improvements and also, you can now search for photos from the Activities Overview;
• Games: 10 games now have modernized window layouts;
• Terminal: automatically wrap lines, setting to use dark visual theme, Solarized style is available by default and it's now possible to search for terminals from the Activities Overview (it will search for commands and display open terminals that match the query);
• Notes: new option to open notes in a new window, as well as a trash bin to prevent you from accidentally deleting notes;
• Boxes: networking improvements and and option to import existing boxes from the host system;
• Music: support for creating playlists;
• Maps: search will autocomplete previous searches, and there is a better minimum zoom level.

Test GNOME 3.12

GNOME Clocks

Latest gThumb 3.3.2 (gThumb from the Ubuntu repositories was downgraded when the Ubuntu devs noticed it's using CSD)

GNOME Maps

Install gtk3-nocsd

sudo add-apt-repository ppa:nilarimogard/failsdownloads
sudo apt-get update
sudo apt-get install gtk3-nocsd

Disable GTK3 client-side decorations using gtk3-nocsd (example)

gedit ~/.profile

export GTK_CSD=0
export LD_PRELOAD=/usr/lib/gtk3-nocsd/gtk3-nocsd.so

gksu gedit /usr/share/applications/gthumb.desktop

env LD_PRELOAD=/usr/lib/gtk3-nocsd/gtk3-nocsd.so

Exec=env LD_PRELOAD=/usr/lib/gtk3-nocsd/gtk3-nocsd.so gthumb %U

GNOME 3.16

• refreshed GNOME Shell theme (including monochrome icons for the applications menu);
• scrollbars are displayed only when needed (see screenshot below);
• GTK+ 3.16:
• OpenGL support;
• themes can now simultaneously support multiple GTK+ versions, by including version-specific CSS;
• a new widget called GtkPopoverMenu was added and it can be used for creating menus contained with popovers;
• many GTK+ Inspector changes including a much improved user interface;
• GNOME apps:
• GNOME's Image Viewer has been redesigned and it now uses header bars;
• Files (Nautilus) 3.16 comes with bigger icons/thumbnails by default, reorganized menus, improved grid and list views as well as a new popover for changing between views, zoom level and sort order. Also, with the latest Files app, users can now move files and folders to the trash using the Delete key instead of Ctrl + Delete, like in previous versions;
• Installation of GStreamer codecs, fonts, and certain document types is now handled by Software;
• Maps can now display information bubbles which show the address, wheelchair accessibility along with links to Wikipedia articles. Also, the latest GNOME Maps comes with built-in Foursquare support, which allows you to check-in;
• Calculator now displays previous calculations so you can easily copy previous figures;
• Boxes comes with an updated properties interface, a new menu makes it possible to send keyboard shortcuts that cannot be entered directly into a box and more;
• smart playlists have been added to Music, so you can view frequently played and recently added tracks. It is now also possible to star your favorite tracks;
• two new games were added: a sliding blocks game called Taquin and 2048;
• three new preview applications were added: Calendar (which already comes with Google Calendar sync), Characters (character map application) and Books (e-book viewer) - these are not installed by default in Fedora 22 but are available in the repositories;
• a new IDE for GNOME, called "Builder", is now available as an early preview (it's not installed by default but it's available in the repositories).

Other changes

• updates that don't work are skipped - this is similar to Yum's "--skip-broken" (which isn't available for DNF), but it evaluates the impact of the problem against the entire transaction;
• repositories that don't work are skipped;
• dependencies are not upgraded on package installation;
• when removing a package, DNF will automatically remove any dependent packages that were not explicitly installed by the user;
• by default, DNF will check for updates in configured repositories hourly, starting ten minutes after the system boots;
• unlike with Yum, DNF allows removing all kernel packages, including running package.

• the Software tool and PackageKit now support searching for packages in disabled repositories;
• Fedora 22 introduces the Preupgrade Assistant (not installed by default), a diagnostics utility which assesses the system for possible in-place upgrade limitations and provides a report with the analysis results;
• GDM uses Wayland by default, instead of Xorg, bringing the transition to Wayland one step closer. The default GNOME session continues to use X;
• input devices use a new driver: "libinput", which replaces other drivers such as synaptics, and provides improved support for multi-touch devices and software emulated buttons (this is only installed by default on new Fedora 22 installations);
• The default console font has been changed to eurlatgr in Fedora 22. The new font has the same typeface as the previously used latarcyrheb-sun16 font, but supports a broader range of characters from the Latin and Greek alphabets as well as some commonly used symbol;
• The Terminal now notifies you when a long running job completes (this is a Fedora-specific feature, that's why I didn't include it in the GNOME 3.16 changes above).

Default packages

Download Fedora 22

• arm.fedoraproject.org - Fedora Images for ARM Computers;
• spins.fedoraproject.org - Alternative desktops for Fedora (KDE Plasma, Xfce, LXDE, MATE-Compiz and SoaS);
• labs.fedoraproject.org - Fedora bundles.

• LightDM doesn't work so if you plan on using these PPAs, make sure you switch to GDM prior to upgrading;
• using these PPAs pretty much breaks Unity: the AppIndicators don't work, the applications don't show up in Dash, the mouse is invisible (update: this invisible mouse issue can be fixed by using the following command: "gsettings set org.gnome.settings-daemon.plugins.cursor active false"), the new CSD applications don't have shadows and there are probably other issues too but I've only used Unity for a few minutes. So only add these PPAs for now if you don't have Unity installed or you don't plan on using Unity;
• some applications may not work properly or not work at all - in my test, Synapse stopped working while gThumb doesn't display the thumbnails properly.

Upgrade To GNOME 3.10 In Ubuntu 13.10 Saucy Salamander

sudo apt-get install gdm

sudo add-apt-repository ppa:gnome3-team/gnome3-next
sudo add-apt-repository ppa:gnome3-team/gnome3-staging
sudo apt-get update
sudo apt-get dist-upgrade

sudo apt-get install gnome-shell

sudo apt-get install gnome-documents gnome-contacts epiphany-browser gnome-boxes gnome-shell-extensions gnome-tweak-tool bijiben gnome-clocks

sudo apt-get remove overlay-scrollbar

sudo reboot

Revert the changes

sudo apt-get install ppa-purge
sudo ppa-purge ppa:gnome3-team/gnome3-staging
sudo ppa-purge ppa:gnome3-team/gnome3-next

sudo apt-get install overlay-scrollbar

GNOME 3.10 video

GNOME Shell / Settings changes

• improved login and lock screens: better layout, nicer transitions, prettier lock screen notifications, etc.;
• various improved transitions;
• pagination in the application picker.

App picker pagination

GNOME 3.10 lock screen

• the lock screen background can now be changed via the Background settings;
• new date and time settings; there's also a new feature here: automatically change the computer's timezone based on the current location;
• new display settings;
• new universal access settings;
• the background can be selected from your Flickr photos;
• Telepathy integration and Google 2-factor authentication for Online Accounts.

• new zoom mode for the scrollbars which allow for fine scrolling - to use it, hold SHIFT while clicking on the scrollbar thumb;
• smartcards are now supported as an alternate way to log in or unlock the screen;
• password authentication can now be disabled, forcing just fingerprint or smartcard authentication;
• initial Wayland support;
• high resolution (HiDPI) support.

GNOME 3.10 core apps

Bijiben

GNOME Weather

GNOME Weather

GNOME Photos

GNOME Music

GNOME Maps

GNOME Software

• Web: DuckDuck go is now the default search engine; Web now has a search provider for GNOME Shell which allows accessing your web history or searching the web from the GNOME Shell Activities
• Contacts: UI enhancements, updated setup and accounts dialogs
• Tweak Tool: redesigned for GNOME 3.10 and includes new options, such as startup applications management, etc.
• Evince Document Viewer: improved accessibility, new Caret Navigation mode, improved Djvu support and a new sidebar showing search results
• Clocks: Pretty new analog timer in stopwatch and timer views as well as geolocation support
• Boxes: support for importing system images (QEMU, raw, vdi - Virtualbox 1.1 image format, vmdk - VMware 3 and 4, vpc and cloop) as well as many UI and other fixes

Web (Epiphany)

GNOME Tweak Tool

GNOME Clocks