Isnt it just an audio thing they're getting that they can say their shouts instead? Cuz if so why can't they make it so you can use any mic or Bluetooth? What's so special about the kinect mic that my Bluetooth can't do? Other than having a lame cam
The kinect functionality is not just the motion or audio sensing. The backend software has voice a recognition API that makes developing things for it easier.
To do it on PC or PS3 Beth would have to write their own VR code.