I think there is something many of the people who say "299 with Kinect 2.0? Day one!" don't quite realize:
According to that document, what they call "Kinect 2.0" is not going to be an improved version of the current Kinect sensor as most people probably believe.
Instead, the document describes "Kinect 2.0" as a stereoscopic system using a pair of cheap and simple standard webcams with microphones. Meaning they are going to completely drop the expensive TOF/3D technology of the current Kinect sensor and replace it with something that costs only a small fraction to manufacture. So the 299 price tag is not unreasonable.
That would actually make it exactly the kind of motion control hardware I always predicted the PS4 to have. I'm wondering if the PS4 will still come up with the same solution.