So we have a date for Nintendo's Motion Plus device. July 26 (my birthday, coincidentally.) I'll need Java drivers, but it would definitely change boogiepants.
One minus: you'd need two of both--the Wiimote and the Motion Plus, which would be $120 full retail. Still better than Sparkfun can currently do. Don't get me wrong, I love Sparkfun, but I gotta prioritize what the customer needs.