I am looking forward to weird experimental games. Like a retro game retrofitted to use the new gyro/compass.
We have Not-Pacman, where you can then use the gyro instead of the nub.
Or picture this: a platformer where, if you are just at the border, you need to move the pyra so that you don't fall down. Or a mario where if you shake the Pyra, the turtles are upside down... and at the end pole, when shaking the Pyra up, allows you to jump higher! (some people actually play like that already, eventhough the controllers dont react to it)
Or: Standing and rotating North to actually in-game move in that direction. For example: Space invaders 360 degrees. (this will look weird to outsiders, though.).. combined with some sounds that tells you there are things coming at you from the left/right/behind. Could be very immersive.
Then just the defaults... rumble enabled when you are bumping the side of the road in F-zero, etc