The new Xbox 360 controller is starting to become available in local stores, at least I think so.

Is there any way I can identify the new controller, either by looks or a serial number or something?

I've seen pictures of it, and it looks like it has a new silver finish, and uncolored buttons, is this the only controller that has those features?

Basically I'd like to know how I can identify it so that I can avoid purchasing an old controller and not discover it until I get home and can open it.