I assume it has to, its only been a year since the last one, so I assume this is an updated version. A year of development time is not a lot to radically change it. Think of it like a sport game. I am intrigued to see how the kinects increased precision will play into this title. There was an update awhile back to kinect that increased the resolution enabling it to be able to see fingers.
shame there is no promotion whatsoever towards this game.. I probably will order with my promotion credits from kinect sports anyway because the achievements in this game are really making positive contributions to my real life.
Some of the workouts on the first one really made you sweat. You have to start somewhere, and you can work your way up to fully do the exercises. Helped me loose about 14lbs. during last winter, and now I am getting this to loose a little more.