The most noticeable adjustment is head size. That's funny, and a little weird, but totally cosmetic and won't get in the way of anyone's Dance Dance Revolving. What's a little more interesting than cranial embiggening is the Wiimote/Nunchuk usage. There seem to be special arrows that instruct players to point their hands in a certain direction, much like Samba de Amigo. Sometimes even the on-screen characters hold Wiimotes and Nunchuks.
The dance pad has made it to the Wii pretty much unscathed, with no Wiimote-shaped cavities or anything. It's a basic dance pad in a Wii color scheme. It appears to be wired, probably USB. We didn't need more-- with the extra waggling, this game seems complicated enough!