Car interiors are full of plasticky knobs that remind me of cell phone keys from 1995-2006. I think that Apple will have a lot of fun creating a new interfaces for everything inside the car, and I think they're wise enough not to try to replace all physical controls with a gigantic touch screen, unlike Tesla.
I'm hoping that many functions won't need a UI any more, such as adjusting the mirrors: http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=118796...