iPhone 5 has just been around few months ago but Apple never stop there. Based on the information, Apple already start design the new iPhone 5 which basically will be named as iPhone 5S.
Apple common style will be keep the same look and feel for at least two years but completely redesign the internal components. We had seen this since iPhone 3G.
Based on the photo, iPhone 5S will have different components but maintain the same outlook. It properly will feature with A6X Processor which is two times faster then current A6 chip but still keep your battery life.