What it Will Look LikeApple's past release, the iPhone 5, was a drastic change from the iPhone 4 and 4S, as it offered a larger screen, and a thinner body. The iPhone 5 is 4-inches, and most expect that Apple will keep the phone the same size, with a 4-inch screen. The iPhone 5 is 18% thinner (just 7.6 millimeters) than the iPhone 4 and 4S and it's expected that Apple will keep the same thinness and perhaps the same weight, weighing just 112 grams. The casing of the iPhone 5S will likely be very similar to the iPhone 5, with an aluminum body, except for a couple notable features. We've seen recent pictures that the iPhone 5S will come in a gold or champagne color, offering something different than the standard black or white iPhone. There have also been pictures indicating Apple will release a graphite-backed iPhone, further differentiating the color scheme on its chief revenue driver. Aside from the actual physical features of the iPhone 5S, the biggest change will likely be to the operating system. "The big update for most users I think will be iOS 7," said Ironfire Capital managing director and Real Money contributor Eric Jackson. "I still think that's going to be the biggest surprise." Apple's latest mobile operating system is a drastic change to its predecessors, with flatter icons and a new color scheme.