Again, I'm no expert here, and someone will probably point out that it is easy to lock down a phone even when everything is GPL like that... It just doesn't seem likely that they're going to be locking anything down, considering the direction Nokia is going with Maemo.
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...