All yummy things in life are either fattening or already married to someone else.

I have been involved in developing infotainment solutions for cars :D

Are you talking about what buttons to have on the dashboard? Almost all high-end cars have buttons which allow the user to switch between various sub-systems (Audio/video playback, Navigation, Phone, Settings etc). Along with that, they also have a rotating knob for scrolling and selecting items. See Audi's MMI or BMW's iDrive for inspiration.

Whether we like it or not, smartphone and app integration with cars is quite inevitable in near future. Apart from opening up a plethora of possibilities with apps, it is also about convenience (just a wild thought: sitting in your house, you plan a road trip with your friends using maps on your smartphone and later simply download them to your car's navigation system). One major example of such an integration is Toyota's Entune.

True. That is why the current trend in In-Vehicle Infotainment (IVI) software is that for the front seat, both touch as well as "button" interfaces are provided (touch interface can be used by the passenger sitting next to the driver while the driver continues to use the buttons). On the other hand, the interface for rear seat passengers is suitable for being completely touch based.

I have been working on the media and navigation software for high-end cars like BMW and Audi for a few years now. Quite often, I feel shit scared even thinking about the possibility of Apple jumping into the In-Vehicle Infotainment segment. If and when it happens, it could be end of the road for established players like the company I work for. There is no way we can hold a candle to Apple's design und innovation.