Thanks ichinisan for the info, you should probably bail before someone starts asking more questions and getting annoying.
Anyway, i'm going to assume for logistical reasons that the nunchuck will have just as many buttons as half of a DualShock 3, thus people can either use their existing controllers as a nunchuck (like they've been showing) or get the nunchuck, basically. Hopefully there isn't only a square & circle face buttons, but who knows. GDC isn't too far away so.
DS3;
dpad
4 face buttons
2 analog sticks
2 left shoulder triggers
2 right shoulder triggers
Arc;
4 face buttons
1 shoulder trigger
1 giant button
∞ 1:1 motion sensing etc
Arc + DS3 (as nuncuck);
dpad (thought not too functional)
4 face buttons
1 analog stick (DS3)
3 shoulder triggers (DS3 L1/L2 + Arc trigger)
1 giant button (Arc)
∞ 1:1 motion sensing etc
Arc + wireless nunchuck;
8 face buttons (4 on Arc, 4 on nunchuck)
1 analog stick (nunchuck)
3 shoulder triggers (DS3 L1/L2 + Arc trigger)
1 giant button (Arc)
∞ 1:1 motion sensing etc
So basically from the DS3 to Arc we're only down one analog stick (which is replaced by motion controls), 1 trigger (since the Arc has one not two), and a dpad which is replaced by another set of [] ^ X O buttons. I think this can easily be applied to any modern game from a button standpoint, whereas before it was in doubt due to the lack of buttons. I still see promise, will wait for GDC presentation.