Unwire.hk (via MacRumors) shows what they indicate may be screen protectors for the new iPhone 5. Interestingly, the screen protectors here show a wide home button (above) and when compared to the current iPhone 4, show a wider screen area (below).
If the current aspect ratio is preserved, the new size would indicate that the screen extended further toward the top and bottom of the device.
Another closeup image, below:
FTC: We use income earning auto affiliate links. More.