But Gribble... in your very own OP you write that rumour has it that the Playstation VR will ship without a camera. So how can you call it VR then?
Head tracking requiers a camera. And you say headtracking IS VR. Thus, a VR without camera can not be VR.
That's nitpicking. I try to clarify:
1. There is no VR without headtracking.
2. Headtracking can theoretically be implemented without a camera - that's what Google Cardboard for example does, using only the builtin smartphone sensors. But this is just an inaccurate makeshift to allow for cheap smartphones alone to be used as VR headsets. Every serious VR system will use at least one additional camera, because they're very important for a accuracy and a realistic experience. PSVR will therefor almost certainly require the camera.
3. Since many people already have the PS4 camera and/or Move controllers, there's no reason to force these people to buy yet another camera or more Move controllers. These people can enter the fascinating new world of (PS)VR for just $299. And of course, a sub-$300 price tag for the core hardware has the nice side-effect of making PSVR seem relatively cheap, after the public was quite shocked about the $599 price tag for Oculus Rift