Let the rumor mill begin, people! We've already heard some news about a fingerprint reader, which our own Charles Gantt reported on late last week, but now MacRumors is talking about the processor inside the currently-rumored iPhone 5S.
The photo below has the iPhone 5S on the left, and the iPhone 5 on the right. As you can see, there's an Apple model number of APL0698 which suggests that this is going to be an A7 processor instead of a modified A6 chip like the iPhone 5 features. The original A6 processor had a model number of APL0598, and the A6X chip had the APL5598 model number, which found its way into the fourth-generation iPad.
This shows us that Apple varies the first digit for members of a given A-series family, with the second digit moving into a new family. The current iPhone 5S prototype that has been caught on camera looks to feature Elpida DRAM, and 1GB of it, the same amount on the A6 processor.