Lines up with this recent Shell Design Rumors, including A few. leaked dummies presumably Designed for Case Manufacturers to Work with . The next iPhone is expected to be announced this Fall, Likely in September, and include The Will. iOS 8 operating System that Will Apple be showing off at WWDC next Week.
Like the dummies mentioned above, this shell features 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. The case appears to be covered in a protective plastic coating, but a bit of silver coloring is visible between the flash and camera cutouts, indicating that this could be for the sliver phone model.