this is one of my day one purchases. As a Kinect fan, I've been waiting for this for a very long time as it was originally supposed to be a 360 title.
In fact, since it seems like the early new XBLA titles will be expensive, I think I'll be buying some discounted Microsoft points before they're all gone. Still have quite some time before points cards are no longer accepted (actually did they announce when you can't redeem cards any more?).