Apple has recently patented a piece of technology that uses IR light to determine how hard a user is pressing on a screen. This doesn’t mean that Apple will incorporate this feature into their upcoming 2014 devices; but it’s possible they will consider it for the generation of devices after that.
The possibilities with pressure detection are limitless. For starters, users could paint and write on their screen with pressure instead of with just one hardness.
Games and other apps could also make use of the added feature. Not to mention that if Apple phones had pressure detection they would blow the competition out of the water.