The latest version of GNOME Control Center can be downloaded from Softpedia
GNOME Control Center 3.13.2, GNOME's main interface for the configuration of various aspects of your desktop, is ready for testing.The GNOME Control Center allows users to configure various components of their system using a vast collection of tools. It's the hub for all the major settings that can be done in a GNOME environment, so it's easy to see why any update for it might be considered important.
In fact, the GNOME Control Center didn't see many changes in the previous GNOME 3.12 release, besides the regular updates and new features. Some changes have been made, but nothing really stood out.
It's used in all the GNOME-based Linux distributions, although Canonical developers have decided to fork it into Unity Control Center for Ubuntu 14.04 LTS and upwards. In any case, it looks like the developers have finally started to come around and are making some big changes for GNOME 3.14.
According to the changelog, new RTL icons support in GTK+ has been implemented, higher-resolution thumbnails are now being used on HiDpi displays, per-network Media, File, and Screen sharing has been added, an initial state when NTP isn't supported has been fixed, a warning provided on startup has been corrected, the Virtualisation bridge is now hidden from the regular users, the monitor label has been improved, "Monitor" has been added to keywords, the Apply button is no longer responding for invalid configuration, and the layout is now displayed correctly when rotating displays to the left.
Also, the "Immediately" option was not being trustful about the allotted time, a crash that occurred when using the vboxvideo glx driver has been fixed, long names and locations are no longer a problem, the dependency on libgnome-menu has been dropped, the search results sorting is now much better and faster, a number of DateTime instance leaks have been fixed, the wrong language is no longer being shown for User Accounts, a filter has been added to the avatar file chooser, a header bar is now used for the "Add Account" dialog, and the UI now changes accordingly if the ICC profile title changes.
A complete list of changes, updates, and bug fixes can be found in the official changelog. You can download GNOME Control Center 3.13.2 right now from Softpedia.
Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.