Anton, I don't know if you have seen the method for head track using the playstation eye, but here is a video of a sony programmer demonstrating it's use and it looks quite nice.
Clearly, just by adding head tracking - the illusion of 3d is increase - plus the added benefit of hands free POV control in the cockpit or virt cockpit. BTW - you can find safety glasses in hardware stores with led lights, just swapped out for IR leds and you have your not-so-goofy headgear.
http://kotaku.com/351539/vr-head-tracking-for-the-ps3
I'm curious to see if polyphony digital will use this approach in GT5.
Kind of ticks me off that this ability has been there for this long and we aren't seeing this being utilized to enhance the gaming experience. I'm curious to see if polyphony digital will use this approach in GT5.