There already is a thread:

http://talk.maemo.org/showthread.php?t=64973

There we're discussing having MeeGo being ported to the HD2 (xda link) and the port to the Nexus One (myNblog).
But 'tis true, Samsung have opened there codes (drivers I believe) and I read this a little while back. This would mean that MeeGo would definetly be (somewhat) possible and it may actually be smooth due to the better CPU/GPU/RAM.