How widespread is it? The 2016 BMW 7-Series is one of the first with it, but you'll see it everywhere in a few years.
What it is: Thanks to the never-ending oneupmanship between Mercedes-Benz and BMW, it's now possible to command your car by pointing, swiping, and pinching. It's called "gesture control," and if it proves successful, a trickle-down effect could bring the functionality to other cars. Just watch your personal hand gestures when you start playing road professor, alright?
Will you use it every day? Probably not. At least, not yet, unless you're a stubborn early adopter.