Mobile Fun have posted up this picture which they claim has been sent to the by a Chinese iPhone case factory, it is a CAD of the specifications required for the new iPhone 5 cases that are to be produced. To me it looks more like an iPod touch due to the camera placement but it does have some key new features that look interesting.

Screen
As much rumoured it seems to show a bigger edge to edge screen which I think we can certainly expect from the next generation

Home Button
We see a much larger home button with the rumours that the new home button will include gestures as well hence the increase in size

Curved Back
Much like the iPad 2 we see a curved rear surface on the rear of the drawing