Apparently, the photo is said to feature the upcoming next generation iPhone while it is still making its way through the production line. If it were to be the real deal, then there is a major difference on the back, sporting a dual camera setup alongside a redesigned antenna.
Right at the bottom, you will find plastic lines that have been retraced. In the new lines, they do seem to stick closer to the top and bottom edge, ensuring that the metal back would more or less remain undisturbed. Not only that, it looks as though the lines are slimmer as well, which is always a welcome addition. The placement of the lines are crucial to make sure the handset has good signal regardless of how you hold the device.