There was some recent rumors about Microsoft removing the mandatory Kinect with your purchase of the Xbox One. The writer gets his point across very descriptively, and I highly recommend you give it a read. Also, with the recent news about the Kinect and their voice/movement activation, I really wouldn't mind chucking in a few hundred to get the Kinect.
Via Oxm
For starters, dumping mandatory Kinect after the example of Microsoft's recent online DRM U-turn may not be a practical possibility - Xbox One has literally been built for the sensor, and it's rather late in the day to go fiddling around at the level of the hardware itself.
Via Oxm