Uh...I dunno. It will be hard to top motion controls. They might as well go diffirent way and implement, let's say, very complicated voice synthesising device where you can give a sample of your voice and the game will generate voice acting for your character in game. Maybe interacting with game characters directly by using digital camera (like in Eyedentify for PS3, hell know when this game is coming out, if at all), you could talk with them or something.....
Really, it's way too hard to tell what Ninty could do next, they might as well stick with the Wii for next 20 years and do nothing.








