A photo of Logitech's upcoming gamepad for iPhone has been leaked online by @evleaks.
Apple introduced support for Game Controllers in iOS 7 and several manufacturers are preparing devices that make use of the new APIs. ClamCase unveiled the 'GameCase' controller for iPad and iPhone in mid-September.
This gamepad needs to be on the sides of the long area of iPhone because of the screen tall look! I bet though there will be a wii u game pad for iPhone!