Back in June when this OS was announced we had seen a prototype Logitech game controller for iOS devices and now famous leakster @evleaks has leaked an press rendered image of Logitech gamepad for iPhone.
As per image this gamepad is more like a case for iPhone and had physical D-pad, four control buttons along with shoulder buttons. Till now its not clear whether this will work via Bluetooth or via lightning connector.
But this gamepad misses triggers and joysticks which we can see in most of the game controllers. Such a product was not possible before iOS 7.