Maybe when there's an e-ink display on the back of the iPhone, or the main display can switch into an ultra low power mode Built-in 2D projector or hologram pr

Maybe when there's an e-ink display on the back of the iPhone, or the main display can switch into an ultra low power mode Built-in 2D projector or hologram projector (eventually with input detection) Force Touch returns to the display but with actual tactile feedback Force Touch but in the hologram or projection Non-contact charging within range of a base station You can also imagine tons of security features for a device that you always have in your pocket