Up in Saskatoon, Saskatchewan, Canada a Nintendo rep from Virginia was demonstrating Nintendo's Mind-reading headband thing.
http://technology.timesonline.co.uk/tol/news/tech_and_web/gadgets_and_gaming/article4354041.ece

It worked amazing! The guy was just standing there, and he was walking around in Call of Duty, turning, moving, and shooting, without lifting a finger. All he had to do was think "turn left", think "shoot", etc, in order to do stuff in the game.
I am pretty sure this thing is going to be their next big announcement in 2010, or possibly in 2011.