To all these people giving negative posting towards a real controller with real buttons..........
I know this is a hard and perhaps new concept to grasp, esp if you are used to Apple products. But what we are talking about is a concept called "Optional"
It means that there can be an "Optional" physical controller, that you can buy if you want to. Then the devs can create games, using the exact same on-screen controls as they do now, but also, you will be able to go into the games settings screen and select your "Optional" controller.
The the on-screen controls will be removed from the screen (which will be nice), your thumbs/fingers won't be over the display area (which will be nice) and you will be able to play the game fine, or probably even better with your "Optional" controller you decided to purchase.
Hope I cleared that up for you