Just saw pictures of Wand/Nunchuk so:
Nunchuck has an analog stick at the front, below that X and O and below that a D pad. Underneath is L1 and L2. Its actually long, not like the Wii Nunchuk.
As for the Wand it has one very big button on top and then all four facebuttons (X,O,Square and Triangle) and underneath is a big trigger called T.
I'm guess the doubling up of X and O across the two is to keep full compatibility with single Wand set-ups.
Anyway, I'm sure we'll see in the week.