I got it today. There was a line as the store opened, some guy in front of me tried to buy 6 copies, but thankfully got kicked out. It's already sold out in most places in my area and it came out today. Online stores sold out of pre-orders before release. So it might be difficult for others to get too.
It's quite an amazing piece of technology, and this game definitely WILL get someone fit. It has tons of workouts and poses I never knew existed. It's quite challenging maintaining perfect balance. If you're not interested in fitness and health however, you won't find anything interesting here. The games in it are quite fun. Skiing is really addictive, it feels so awesome. Even some of the aerobic exercises are fun, like the rhythm one and jogging around the cool environment. But basically if you don't think normal exercise is fun, this game won't change your mind.
Half the games content is still locked, and i'm looking forward to playing more each day. It tracks your progress similar to Brain Training with a calender and graphs. You can even add things you don't do in the game to it (anything from swimming to piano / guitar playing, and minutes spent doing it), so it can basically keep track of all activities you do if you want it to. I don't think i'll be doing that, but it's a nice way to keep things organized.