I don't really expect migration to happen really soon unless someone waves a magic resource wand and frees up a couple of people to finish wrapping it up.
Musea took the lead early on but then had to drift off to work for money (boo-hoo for them, eh?) I fixed a bunch of Postgres-related performance problems that makes the site practical to run (though I'd like to speed up bboard even more). But now I'm busy juggling contract work with trying to finalize the OpenACS 4 beta (very close, very close!)
So what really needs to happen is for a couple of folks to step forward and offer to push on.