MeeGo is being rolled into a new version of Linux and will cease to be knows as MeeGo. Development will shift away from MeeGo-specific apps as well. This should complicate the process of getting apps for the N9. Anytime they promise to "make the transition easy" I think "uh-oh".
MeeGo to be folded into Linux-based Tizen OS, slated to arrive in 2012 -- Engadget