Anyone know if there are two distinct Command buttons, as interpreted by OS X? If so, I'm hoping Apple lets us change the shortcut, as some third-party keyboards may just implement two 'LeftCommand' or 'RightCommand' keys instead of one of each (I know they do this for Shift keys sometimes).
It's probably going to be two consecutive Cmd presses, and not two different keys at the same time...just like pressing the Home button twice on iOS - yep, just another iOSification coming to your Mac.