Here is a picture of the MotionPlus, and what Nintendo says about it:
Nintendo’s upcoming Wii MotionPlus accessory for the revolutionary Wii Remote controller again redefines game control, by more quickly and accurately reflecting motions in a 3-D space. The Wii MotionPlus accessory attaches to the end of the Wii Remote and, combined with the accelerometer and the sensor bar, allows for more comprehensive tracking of a player’s arm position and orientation, providing players with an unmatched level of precision and immersion.
I really love Nintendo for innovating in the field of interface design in gaming and technology. Looking forward to checking this out and all the new possibilities this is opening up, to further spur game design.
Games publishers: Bring ’em on!