If you check out the video in the OP, Sony are also developing a "wand" type device that the camera can track very accurately. So if head tracking doesn't go off facial features alone, there could certainly be some dedicated head gear derived from the wand...

But to answer your question, I would wait to get a camera... The wand may come with one. Or the whole thing may be crap or never appear. You never know.

Thank you sir, I will certainly heed your advice. :)