Don't underestimate Nintendo's ability to under-deliver when it comes to new hardware. They have been behind the curve for 2 generations now. The N64 is the last Nintendo system that really went after high-end technology. Since the N64, Nintendo has decided to go with a strategy of "just barely enough", when it comes to their hardware technology. They love "just barely enough", combined with an exciting new gimmick. The new Wii U controller with the screen is obviously going to be their focus, so I wouldn't necessarily bank on them having a more advanced Wii-mote that is beyond the motion plus.
I hope I'm wrong on this one, cause they should try to have a wand that is even more accurate than a Playstation move, and they should definitely have a wireless nunchuk this time.