This is how!
I'll expound a bit on my previous post to make this clear what iOS in the Car is:
The whole goal here is to let the phone export video to the head unit and accept touch input from it. Nothing more. By keeping the software on the phone itself, it reduces problems in the long run. This isn't new technology.
AppRadio, MirrorLink, iOS in the Car. They are all really the same thing in the end. Just different implementations of the same idea. If a head unit supports both MirrorLink and iOS in the Car, they cover both Android devices and iOS. You already see Pioneer units that support both their AppRadio system for iOS/Android and MirrorLink for Android units.
And this won't replace existing inputs in head units either. It is just another 'mode' the head unit can be in.
If Apple were to make a actual head unit, that you could buy to put in an existing car, just like an aftermarket head unit that people do everyday. I'm sure an Apple head unit would be incredible, and would be a great option for people who are upgrading/updating an existing car. Example I build street rods in my collision shop and my existing 1931 Ford has a Pioneer head unit that is compatible with iPhone's/iPod's/iPad's but limited. So what I hope to see, is software that car manufactures & aftermarket car audio company's can develop that is much more intergrated with our mobile device's. I think utilizing a touch screen in dash that will either plug or Bluetooth your iPhone/Etc, into the touch screen head unit.
I myself want to come up with an App that could control your entire car, right down to displaying engine vitals from sensors with Bluetooth and a plug in option. With the GPS speedo Apps (that are very accurate) the possibilities of simulated instruments on the screen of an iPad Air or iPad Mini are endless!
With the custom car world this would be one of the coolest new ways to have interment panels with a docking setup that would make an installed iPad/Etc. look as if it was built in. This could also be another anti theft security. Passwords or complete removal from the car dock.
I think car manufactures/aftermarket audio Co.'s will be doing just that, an option on the existing car head unit touch screen that would act as the iDevice or Android when connected.
Sorry for going off the path here. I just want a head unit or control unit that I can put in my 31 Ford Street Rod that my iPhone/iPad can plug into with deep iOS integration, not just for music.