1. Do you think this community will be the starting point or merging point with the Meego community?

I think people that are interested in Meego will go to Meego.com and people interested in Maemo will stay at Maemo.org. They are not mutually exclusive though. As far as I know there won't be a 'mass copy' of user ids from Maemo.org -> Meego.com so if you want to contribute over there you need to create an account there manually.

2. Do you think it will exist until Maemo will be completely forgotten?

I think Maemo.org will exist until Nokia stops paying the bills. The Maemo "community" may live on after that on some other site/sub-forum until the very last person gives up (estimated time: Jan 24, 2013).

3. Do you think it will update Maemo to new versions until the supported devices will render obsolete (say Maemo 6, or PR 1.3) ?

If you by "it" mean Nokia then I'd say that personally I think there's a 50-50 chance that there will be a 1.3 update but after that I don't expect to see any kind of official support for the Maemo5 platform.

If you by "it" also include community efforts like the SSU then you may well see 'support' for Maemo long after Nokia has moved on to the next shiny thing. (Maemo6 is for all points and purposes "Harmattan" - which, is MeeGo").

4. Other?
I'm about to have a cold beer and some crawfish.