Xbox 360 controller are way overpriced. The wireless one especially, it's not worth it. Usually I'm all for wireless, I love my Wavebird to death, but the wireless 360 controller is a total ripoff. It's $50, and you only get like 40 hours out of it (which is like half the wavebird). The Charge and Play cable is a good idea, but it costs an extra 20 bux, and then your controller is wired for a while anyway....$70 for a generic controller with bad wireless battery life? No thanks. Plus the cable on the wired one is pretty long anyway.
Anywho, I love the idea of packaging in two controllers, and I think that's what's going to happen. They need it if they're going to come out with two-remote games (at least anywhere near launch). Plus, a big focus is on multiplayer, especially the Wii Sports titles, and if they want it to be completely accesible out of the box, then they neeed two controllers.
Plus, Wii has two i's.