Between Canonical shipping unity and Redhat shipping gnome shell with gnome 3, it's going to to be a turbulent spring on the linux desktop. The screams of protest about the gnome shell are already strong on the F15 alpha forums. I've used both and I'm not sure they're so bad, but everything takes some getting used to for people. Then again, I use KDE and am very happy, 4.6 runs and looks great though I do use a dock.