Rumor machine @evleaks posted this image of what could be a forthcoming iPhone gaming controller from Logitech.  The leak looks legit, based on Apple's reference for such a controller released at WWDC this year.

It looks similar to one of two designs that Apple released in the iOS 7 documentation over the summer. The tweeted image looks like your standard SNES controller. There's a four-way directional pad on the left, and ABXY buttons on the right. We're not sure what's at the top of the controller, but it looks like the left and right shoulder buttons from the spec controller are there as well.