Apparently both sections that clip on either side of the display will contain force feedback and motion control capabilities.
The latest information leak relates to the functionality of those detachable controller units.
Only this time, there’s no wire like there was between the Wii remote and Nunchuk and you’ve got advanced force feedback, too.
The motion control is thought to be the equivalent of the Wii Remote Plus, allowing for input to be recognized from rotating the NX controller as you play.