Obtained by Macfixit Australia (via MacRumors), the cover also suggests that Apple will ditch glass antenna breaks with its iPhone 6, opting instead for an all-aluminium design featuring smaller breaks at the top and bottom of the device.
Besides this, the rear cover also features rounded corners like both of Apple's current-generation iPad models. It looks as if the design of the iPhone and iPad could be unified somewhat once the next-generation smartphone is released.
Before the iPhone 6 is unveiled, however, Apple is expected to preview iOS 8 – its next-generation mobile operating system – at WWDC on June 2. We'll be covering the event live, so be sure to check back with us for all of the day's news as it's announced.