VentureBeat had a handson experience with Razer's Hydra motion control system at CES 2011. The system is expected to be released in April for under $100.
The Sixense TrueMotion technology, under development for some time, uses a magnetic field to detect your movements as you wave wireless controllers around the air to control a game. That lets it detect any of your movements, and it doesn’t have to rely on line-of-sight from cameras, giving it a leg up on the Kinect technology in this regard.
The TrueMotion technology, made by Sixense Entertainment, will be used within a licensed product, the Razer Hydra, and packaged with Valve’s Portal 2 game in a special bundle due in April.