Tbh, I don't know. On one hand, the car industry is heavily regulated, extremely hard to break into, and margins are not great. Just look at the media darling Tesla. They're garnering a lot of good (and some bad) press, people seem excited about them, but their cars can easily run over 100,000 dollars. Yeah I think they're moving to roll out a cheaper model, but so far they are a luxury brand. To that end, they've yet to get a profit. Then there's the trouble they've had in rolling out to new locations since people are so used to going to a dealership. There are no dealerships, at least in the traditional sense.
I just don't see a market for Apple to produce a car. I think they may be working to include components to integrate into cars, and that's a smarter move. Kind of like John D. Rockefeller. He could have gone drilling for oil like so many other folks, or he could have set up refiners and produce something that both oil speculators needed (a place to refine) and customers (needing oil/gas/etc).
Apple has a lot smarter people then me, so I'm only going on my limited knowledge, but I don't see anyone revolutionizing the auto industry, it may transform, but it won't be revolutionary.