How can I identify the new Xbox 360 controller in stores?

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.

While you can identify it by looking at the new d-pad, and easier way might be to look at the colors. The new controller is entirely made up of shades of gray. I think this is the only controller where the buttons aren't the standard colors.

Amazon categorizes the controller under silver, so that might help you identify it as well (although I don't recall if the packaging lists it as silver or not).

It is a silver controller as mentioned by others and the D-Pad is distinctive. The box it comes in is also labeled as "Special Edition" and also includes mention of the Play & Charge Kit which is not standard with all of the wireless controllers. A view of the packaging can be seen below:

I think the key thing to keep an eye out for visually is the new transforming d-pad. On the old controllers this was one solid lump of plastic but on the new ones you can twist it to raise the position of the up, down, left and right arrows.