The United States Patents and Trademark Office has released the application by Nintendo of what appears to be a Game Boy case for your phone. The front has the classic A and B buttons across from a D-Pad with a small window for a screen.
This would be a nice start for Nintendo to get into the mobile gaming world fully. Though why take a large screen device then restrict it to a very tiny area for a display? Also the ever changing phone shape sizes gives this patent another draw back.
I for one would love to see Nintendo ports games made for mobile with a form of controller to use with it. It could feature an in-app purchase system to grow the collection. With the release of the SNES and NES classics being smash hits there is definitely a market. Sadly, Nintendo doubtfully wants to share in Apple’s 30% cut of all sales from the AppStore.