While Sony is currently promoting Move, today Siliconera.com (linked above) has uncovered a patent for a Kinect-like PlayStation device filed by Sony Computer Entertainment America.
While it's not a controller-free environment, the new controller device does track the location of players.
To quote: It's equipped with a gyroscope, accelerometer, magnometer, and most interestingly an ultrasonic transmitter. The controller uses this to communicate with another device to determine the location of the controller and player through echolocation.
The controller is half of the gizmo. Users also place this device on the floor and it communicates with a console via radio signals.
Sony equipped the floor sensor with a motion detector, cameras, sound processor, and another ultrasonic processor. Image detection lets it know where players are and if it has been moved.
Like the PlayStation Move controller, it has LEDs on top that provide visual feedback for in-game events and when your batteries are low. An onboard sound processor and microphone are present for voice control."
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