I saw a Kinect actually setup and in use at a Best Buy today. I figured there would never be in store demos of those based on what the video game websites say. They make it sound like you need a huge room for it to work but they had it going in a pretty small space.
From what I have read about the Kinect it sounds not ready for prime time. Like Dance Central which sounds like the closest thing to a full fledged game only works with one player at a time.
The thing people like about the motion games is getting a bunch of people together and acting silly so only being able to have one at a time seems ridiculous.
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Matt