I want a SNES version of the Wiimote. Wireless connection to the Nunchuck. 4 buttons (ABXY on the wiimote side) R and ZR buttons where the B Trigger is on Wiimote. Analog stick where D Pad is. Improved motion controls for the nunchuck and analog for left side, and a ZL and L buttons on left side. Option to snap both sides together like a Pro controller. Battery efficiency like the Pro controller.
Most importantly, the option to install games to the HDD for faster access. Whatever system power it has will be plenty for what Nintendo wants. Real question will be if its enough to appease 3rd party devs. (odds are it will never be enough.)