Gnome development team today posted on blog about new GNOME 3.13.3 , From the blog and post and some screenshots we can its a improved and polished , There are many new features are added in gnome 3.13.3 like network sharing control option and joining media server from online accounts pannel .

Whats New :

Improved Adwaita theme
According to blog post they rewritten and improved Adwaita theme completely

There is quite a bit of good new stuff in this release, starting with a rewritten and improved Adwaita theme that is now part of GTK+

Network share controls and media server support

The following modules have a new version:
– bijiben (3.13.2 => 3.13.3)
– evolution (3.12.2 => 3.12.3)
– four-in-a-row (3.12.2 => 3.13.3) ()
– gedit (3.12.2 => 3.13.2)
– gnome-boxes (3.12.2 => 3.13.3)
– gnome-klotski (3.12.2 => 3.13.3) ()
– gnome-logs (3.13.2 => 3.13.3)
– gnome-maps (3.13.2 => 3.13.3)
– gnome-music (3.13.2 => 3.13.3)
– gnome-robots (3.12.2 => 3.13.3) ()
– gnome-software (3.13.2 => 3.13.3)
– gnome-sudoku (3.12.2 => 3.13.3) ()
– gnome-weather (3.13.2 => 3.13.3)
– orca (3.13.1 => 3.13.3)
– rygel (0.22.1 => 0.23.1.1)

Above info Source : http://ftp.nara.wide.ad.jp/pub/X11/GNOME/apps/3.13/3.13.3/NEWS

For fedora users you can try new Gnome using this repository : http://copr.fedoraproject.org/coprs/rhughes/f20-
gnome-3-14/

This is also a good occasion to announce publicly that we are aiming to have GNOME 3.14 in Fedora 21 – it may be a little tight, schedule-wise (the GNOME 3.13.91 beta release happens on Sep 1, a few days after the beta freeze for F21), but we’ve been able to squeeze things in, in the past.

Source : http://blogs.gnome.org/mclasen/2014/06/26/gnome-3-13-3/