Face/Head tracking are already in the current dev kits. I don't think Sony was able to quickly add these features to the SDK and go back in time to ship them to Devs prior to E3. I guess I am saying that Natal's demonstration didn't influence Sony.
My biggest concern with both this and Natal is Sony/MS will delay first/third party games to include non-sensical motion/gesture schemes just to show increased support for their products. I like to exert as little energy as possible while playing video games.
Thanks for the input, Jeff.







