Majesco has partnered up with Beto, (the creator of the Zumba workout) to create Zumba Fitness, which will be available for the Wii, Kinect, and Playstation Move.
Zumba Fitness is much like other dance games at its core, but rather than your standard top 40s songs, Zumba Fitness focuses more on latin dance and reggae flavours. There's a lot of emphasis on hip movements, as the game is also a workout tool. You can really see this in the Wii and Move versions, as they include a belt which you strap the controllers onto.
Nick and I actually got to try the game out (Kinect version) and while we both embarrassed ourselves, the game was quite a bit of fun. You can see how the game tracks you, behind your dance instructor, and it's very accurate. You'll be able to try for yourself this holiday season.