I haven't been able to find much information about this, but will only one set of controls be approved for iOS controllers? I remember seeing this picture floating around some months ago:
It would be a pain in the ass for developers, and thus consumers, if hardware manufacturers start making controllers with different controls.
The GameCase looks great though!

It would be a pain in the ass for developers, and thus consumers, if hardware manufacturers start making controllers with different controls.
The GameCase looks great though!