* GNOME fallback was the logical move from GNOME 2. * MATE isn't in the Ubuntu repositories.* Unity is all over the place at the moment. 12.04 has separate 2D and 3D versions, but supporting 2D is basically a dead end.
Maybe Trisquel 6.5+ could use Unity. That depends on if anyone else wants to work on it. Ruben said that he wants to focus on one version of Trisquel in the future, and other hackers can volunteer to create other editions.
