The leaked rear chassis purports to be from the 4.7-inch model, which is the smaller of two devices rumoured to be planned for launch this fall. So far, no leaks of the larger device have surfaced.
This piece of metal, in protective wrapping—you can make out a flash of silver if you look carefully—shares features shown in images leaked by Sonny Dickinson earlier this month. It has two distinct antenna breaks at the top and bottom, rounded corners, a circular cutout for the LED flash, and a larger overall size than the current iPhone 5s.
Of course, the veracity of this rear chassis is up for debate—and we've long enough until the fall for Apple to release something quite different, because it certainly won't appear at next week's Worldwide Developers' Conference. [MacFixit via 9to5Mac]