Maybe someone can correct my uninformed opinion on this (plus I've had the same iphone 4s for about two and a half years), but doesn't it seem like all the cool stuff is happening on Android?
Android: Pause video when you look away, send data by bumping two phones, run multiple apps at once, watch/wrist devices
The problem is, these "cool" things you mention are mostly just marketing and don't work very well. I have only heard complaints about Galaxy Gear. Same for the eyeball tracking stuff on the new Galaxy phones--it just doesn't work very well.
Android: Pause video when you look away, send data by bumping two phones, run multiple apps at once, watch/wrist devices
iPhone: Now in five different colors