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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)
Wireless battery charging
Though it has yet to really take off, some modern phones have launched with wireless charging as its main gimmick. The likelihood of its implementation is slim, but the trend it would set could propel the technology into the mainstream in the smartphone sector.