Design and a business model that doesn't rely on actually selling cars.
I have this gut feeling that owning an electric car will end up being the "blackberry" moment for the auto-industry - a near-term phenomenon that turns out to not be representative of the future. I still am of the opinion that the future of cars is autonomous ride-sharing. People won't own cars; they will share them and Apple would certainly have size necessary to form that critical mass of users needed for a ride-sharing car network.
The more I think about it, the more the economics of owning a car becomes less appealing over time, much less everyone owning their own self-driving car. It's parked in a carpark 90% of the time, and the fewer cars on the road, the less congestion, the less space need to be used for carparks and supporting infrastructure, and more space for everything else.
For all the technological improvements that cars have had over the year, the primary design hasn't really changed. I think there is potential for a company like Apple to rethink the entire car experience using their expertise in software and manufacturing, not unlike what the iPhone did for the smartphone industry.
For instance, a car could be reimagined as a room on wheels, which can be customised to whatever layout you want, since you no longer need a driver in front. Apple also has the necessary ecosystem and infrastructure in place, from Apple Pay, to maps, to Siri, to communications to even their own entertainment bundle.
It's all about skating to where the puck will be, and I don't think the future is simply everyone owning an electric car.