the Microsoft blog says to expect it sometime in early 2012.
Microsoft has also made available an updated version of the beta SDK. If you're the type of person who can actually mess around with that thing, you can snag it from the newly-launched Kinect for Windows site. You know, if you want -- we don't care either way. We're too winded from this afternoon's Dance Central 2 session and need to lay down for a bit.