The idea of applying player emotions to a game would be neat, but the easiest way to read my in-game emotions is when I'm going around killing everyone. "He must be mad." >.
I don't really know much about the inner workings of patents, but hasn't something with facial recognition already been done with robotic android technology or something...?
A few digital cameras can automatically take pictures when the subject (s) smile. I wonder if this patent will be in conflict with this preexisting feature.