Not so much on Cirque du Soliel, but the reasoning behind using them arbitrarily. Why not get some Wushu performers while they're at it?
In any rate...
http://arstechnica.com/gaming/news/2010/06/natal-outed-as-kinect-while-360-slim-rumor-gains-speed.ars
USA Today revealed this list of Kinect games:
* Kinectimals: A virtual 'big cat' trainer that lets you train and play with 20 different feline members of the animal kingdom, including tigers, lions and cheetah.
* Kinect Sports: Microsoft's answer to Wii Sports, Kinect Sports features table tennis, boxing, bowling, soccer, beach volleyball, and track and field; all controlled using your body.
* Joyride: This one looks to be a kart-style racer—grip your hands on an imaginary steering wheel and use your foot for the gas and brakes.
* Kinect Adventures: This game combines a river raft simulator (recently seen on Youtube) and obstacle course for up to four players. Rafting works in pairs, with players working together and moving in the same direction to steer. Jumping will also grant access to secret areas.
* Dance Central: Developed by MTV games, this is a motion-controlled dance-off.
* Disney and Lucasarts have also announced that classic Disney and Star Wars characters will be appearing in upcoming Kinect games.
Edit*
is much better than this imo...