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Cameras: Increased Megapixel front and rear iSight, with True Tone Flash
It goes without saying that Apple is likely to use a higher-megapixel CMOS in the rear and forward iSight cameras. It would not surprise me to see 8MP in the rear and 2MP in the front, particularly for newer augmented-reality apps as well as high-definition Facetime and possible facial gesture recognition and security enhancements to Siri and iOS 7.x.
Additionally, I expect some improvements in the lens elements to allow for improved image capture in lower-light scenarios, as well as improved image stabilization software and incorporation of the iPhone 5s's True Tone flash.