Linux Mint Debian (LMDE) is a rolling release distribution based on Debian Testing.
LMDE Update Pack 4
, which will include Linux Kernel 3.2, Mate Desktop 1.2
(a renamed GNOME 2 desktop), Cinnamon 1.4
(GNOME Shell fork), GNOME Shell 3.2.2, KDE 4.7.4 and Xfce 4.8
, "is being prepared and tested at the moment" and should be available soon.