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Stronger antenna for simultaneous voice, data
A third antenna would support simultaneous voice and data, allowing users to receive emails while they're on the phone. However, following so-called "Antennagate," where a redesigned metal body appeared to cause a dip in cell signal when the iPhone 4 was held in a particular way, Apple may not want to risk any changes to the device's antenna.
Faster system memory
Unlike some phones, the iPhone is quick and responsive, thanks to its powerful memory and processor (more on that later). The iPhone 5 comes with 1GB of system memory, twice that of the iPhone 4S. While the device's memory bandwidth continues to exponentially increase, we can certainly expect faster graphics and on-display response times in the next iPhone.
Advanced haptic feedback
Apple patented a haptic feedback system — a method of providing physical response to a touch with a subtle micro-vibration, for example — back in 2012, but nothing ever came of it. The next iPhone could come with a feature that could further draw users away from the hardware keyboard crowd.
(Image: U.S. Patents and Trademark Office)