I don't know the actual status, but I do know that there aren't that many people at Microsoft officially working on F#. That could change, but I don't know the specifics.
I don't think there's ever been many people working on f#...(compared to c#)
Its good as it is anyway.
Yeah definitely don't take this as a reason to avoid F#. It's open source anyways, so it'll be maintained regardless. Plus the team has gone to heroic lengths to integrate an ML into .NET. Their unification process is insane and probably technically undecidable.