One of the strongest rumors about the iPhone 5 is that it will have a curved glass display. This rumour is floating around based on an article in a taiwanese newspaper saying that Apple had recently ordered glass cutting machines with the capability to carve glass. The iPod nano is one of the few devices with a curved screen display. However another possibility is that Apple plans to make the back of it's device with curved screen display. ( Another one of their attempts to make the iPhone thinner )