Lot of ANSWERS:

http://wiki.maemo.org/What_can_we_re...or_my_N900_.3F

And can we wait to end of the month to see what they will offer to us? See post from Quim.

I don't need/want upgrade my (cool!!!) Maemo 5 to Meego on N900. I'll buy NX for Harmattan (and next NY for 100% MeeGo) - and run all my Qt programs on it.