Longer-lasting battery life? This is just a guess, but it'll probably be the same. Apple specified increased battery life as a feature of iOS 9, which means the company doesn't necessarily have to jam in a larger battery to quote the same battery life estimates as the iPhone 6 and 6 Plus.
Better camera? It wouldn't be a new iPhone without an improved camera. Apple aquired LinX, an Israeli camera technology company, earlier this year. LinX developed impossibly small, multi-lens cameras for smartphones, tablets, and ultrabooks, so that's a perfect fit for Apple's product lines too. According to 9to5Mac, the iOS 9 developer betas hint at a front-facing camera that supports 1080p video at 240fps and flash — none of which appear in the front-facing FaceTime camera in current devices. As for the rear-facing camera, PhoneArena.com claims to have found documents suggesting it will be getting an update as well, with a 12-megapixel sensor and 4K video recording capabilities.
Lightning or USB-C? Lightning is pretty new. Keeping it around lets Apple continue to license it, whereas USB-C is an open standard. We applaud its arrival on the Mac — growing pains notwithstanding — but it might not be time yet for another big switch on the iOS side.
Smaller-screened iPhone mini What about going back down? Apple no longer sells any phones with a screen size lower than 4 inches. But we think a section of Apple's customer base would go gaga for a return to the 3.5-inch screen of the first several iPhones. Model it after the original 2007 iPhone — which already bears an uncanny resemblance to the Apple Watch — call it the iPhone Classic, but give it all new internals to run iOS 9. It worked for the iPod mini, and we think it could work here, as long as Apple keeps the larger-screened versions too.
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