Hello Linux Geeksters. As you may know, Ubuntu 14.04 Trusty Tahr will be released with Unity 7, the Unity version running by default on Ubuntu 13.10 Saucy Salamander. While Unity 8 is already under development and used by default on the Ubuntu Touch images, it has been created to run over Mir, and not X.org.
The Canonical developers have released a new major update for Unity 7, implementing a lot of changes in it. The GNOME Control Center has been temporary replaced by Unity Control Center, the plan being to use Ubuntu Control Center (which will be used as default on Ubuntu Touch also) on the stable version of Ubuntu 14.04.
Multi-monitor support for EMConverter in Unity settings has been added, the shutdown dialog and shortcut overlay have been made transparent and the Quicklist and Tooltip active blurring has been enabled yet again. Also, the users are able to lock their computer via a new key combination Super (Win key) + L.
For now, the new Unity 7 is not available for Ubuntu 13.10 Saucy Salamander and most likely, it will never be patched to work on Ubuntu Saucy, due to the fact that it will reach EOL soon.