The most striking change is in the display, stretching it almost edge-to-edge (hence minimizing the width of the size bezels) means that the physical dimensions of the phone won’t get much bigger than the current iPhone 5s design, despite the significant screen-size increase from 4 to roughly 4.7 inches diagonally.
The renders also demonstrate the repositioned sleep/wake button, which is located on the right side in this interpretation. As expected, the renders also show a thinner profile, expected to be about 20% thinner than the current generation of iPhone.The back of the device also , visibly, ditches the two-tone design used on the iPhone 5 and 5s.
Note, however, that the flash is not dual-LED like the 5s. This has fuelled some recent speculation that the next-generation iPhone depicted in these mockups is actually the successor to the iPhone 5c, not the 5s. Aside from the standard flash, this theory does not yet hold much weight however.