Cydiablog has posted a video showing the leaked iPhone 5 back cover. The video was taken by eTradeSupply and they noted the following about the new unibody back cover:
The next generation iPhone will be the same width as the current 4 and 4S models, but will be taller in size – around 4-inches diagonally.
The upcoming iPhone will be much thinner. The exact dimensions are unknown, however.
The leaked part is neither a battery door nor a middle plate. It is a single integrated part. The iPhone 5 back plate is one piece anchored by an aluminum alloy. Major design changes in the upcoming iPhone.
Earphone jack has been moved from top to the bottom of the iPhone.
Apple has redesigned the dock connector which is smaller in size. SIM card tray is different in size – a smaller one. So, expect a smaller SIM card tray.
Enhanced speaker grills. If you carefully examine the video, you’ll notice an extra space at the bottom – may be to enhance the speaker’s quality.