They could take the also-ran approach and add in visual full-motion detection. I'd rather see something a bit more original though. Perhaps enhanced motion detection. They could improve the motion detection in the wand, add motion detection to other parts of the body such as feet, torso and head. Motion control as the game controller is here to stay.
They could add in home-entertainment convergence features like Blue-Ray and better Internet functionality. Again, though, that would be a bit of playing catch up.
Augmented reality goggles might be a good addition. Of course, with that, they would have to put some real thought into game design. New and unique features are cool, but the novelty wears off quickly if the game play doesn't do a good job of integrating the new capabilities.
Nintendo pioneered the use of motion sensors in its Wii console. The company announced April 25 it will roll out its next-generation console in 2012 and show a playable version at the big gaming conference in June. OK, engineers, here's your chance to weigh in with ideas about the next cool technology ready for the mass consumer electronics market. What you would put in a Wii 2.0?