Just a few thoughts... as a N800 owner it's funny to see people freaking out that their device is already obsolete. When Fremantle came out, my old tablet suddenly started getting updates and new features to it's old apps. The device doesn't turn into a piece of suck when it's successor is released. It's still the same device it was when you bought it - only more mature because of all the bugfixes and refinements that came along the way. I cling on to my N800 because for my use cases it is still superior to N900. The same might happen to you with your N900.

So everybody take a chill pill, sit back, relax and see what's coming... I wouldn't rule out that eventually you'll be able to run MeeGo or some community version even on the N8X0 and 770 devices