I can do this with iPhone 6 already. And could do with iPhone 5. In a 2013 model year car. There is an USB port in my car, connect lightning cable and thats it: phone is charging, music is playing.
But then you have to rely on the car's data USB port supplying enough current to charge the phone while the audio + GPS are draining the battery. That's not always a sure bet, depending on the particular car's specs.
I have 2x Dodge Caravans 2005, and a 2000 Miata. Luckly the vans have AUX ports along with the mid-vehicle 6 disk dvd player. No usb, bluetooth, or tape deck.
