The Asian site Unwire.hk had access to an accessory that was supposedly developed for the iPhone 5. In a superficial analysis, the changes match the icon we saw in Photo Stream. The images show a button Home rectangular, in addition to a considerable difference in the size of the device as a whole:
As the protective film completely covers the front surface of the gadget, there is no delimitation of where the screen starts / ends, so it is not possible to draw conclusions about the size of the display with this accessory alone. However, it is possible to note that the space reserved for the front camera and the speaker is a little closer to the edge:
Several cases designed for the iPhone 5 have popped up in the last few months and many of them bet on the same design: rectangular button and wider device. Regardless of the rumors, there is little to know the real device.