Went and picked it up last night at Meijer at 12:01am too. There was a modest line, but a line nonetheless.
Played about half-an-hour before bed last night, and was very surprised by the quality of the workout, particularly the flexibility-building emphasis with the yoga component.
Look out. This thing is going to go gangbusters. I would not be surprised if this winds up being a Top 5 seller, all time, if not the best selling "game" ever. The only drawback, of course, is that there are 40-50 million potential customers for it that still can't find a Wii. This'll be a slow, steady seller for years.