The iPhone 6 should be a new design in keeping with Apple's traditions. Now that everyone is talking about the possibility of using Sapphire in the screen. It got me wondering if they would try a glass back and screen again. I've seen videos of heavy cinder blocks pulled around on a phone with a Sapphire case and it didn't make a scratch. Now considering that was just a case imagine Apple's engineering. Would an iPhone 6 with front and back Sapphire/Glass be something people would want? or would it remind them of the iPhone 4?