http://blog.linuxmint.com/?p=1875

apturl is now fully functional

adding PPA repositories was fixed

MATE received a critical update to mate-session-manager
(this bug prevented MATE to be started from the login screen for i386 users)

mintMenu was ported to MATE

packages now open with gdebi

mgse-menu received keyboard navigation and multiple bug fixes

mgse-windowlist was given a brand new look and now looks extremely similar to
the Gnome 2 window list

mgse-bottompanel now makes it possible to switch between workspaces
using the keyboard shortcuts Ctrl+Alt+Arrow keys

Mint-Z now features silver-looking bottom panels, menu and window list which look similar to Mint 11,
as well as a new theme called Mint-Z-Dark which features black components and looks like
an improvement of the MGSE desktop from the RC release.

The ability to open directories as root was added to Gnome 3