Wireless charging
While I think the implementations that require a charging pad are pretty pointless, there have been persistent rumors that Apple is working with a company called Energous that claimed to have perfected wireless charging at a distance of up to 15 feet. Apparently they signed a deal with them that gave them dibs on being the first to support their technology.
It is possible the iPhone X will have an unadvertised capability to use this and not be limited to pads, which would fit in with rumors HomePod will charge devices within a range of three feet. Three feet is still too limiting IMHO but at least it would be proof of the technology - presumably something explicitly designed for distance charging would be able to do better. I think the big win for this type of technology would be for laptops - a few such chargers in suitable locations around your home would enable you to never need to plug in your laptop!
The best feature would be the cries of anguish from all the nutty "electrosensitives" who claim they get physically sick from wifi and cellular, but somehow UHF TV broadcasts at far higher power never seemed to bother them...