I don't see any head tracking capability mentioned in your original post, other than a separate head tracking device ($2800!). It and the glasses in your second link are apparently compatible with a sum total of zero games, so I'm afraid that I'm missing your point. I never meant to imply that this thing is the first device of its kind, but they are the first consumer level product with practical gaming abilities.
Perhaps you'd care for a few bites of crow yourself. It tastes a bit like chicken.