Apple and Gaming

So, I was poking around for games on the app store for my iPhone 5, and I decided... I'd really love to see Apple release a device that runs iOS but is focused on gaming. So let's discuss! What do you think of such a device? What kind of specs should it have?

I realize that yes, the iPhone 5 is very capable at game, and so is the line of iPads and the iPod touch, but for me the device would have to have about a five to six inch screen and be built more like the iPhone than the iPad mini.

What do YOU think?