It's a car and it's not a "pivot". The Mac, iPod, iPhone, iPad, Apple TV and Watch are all about apply the same philosophy to new product categories and then tightly integrating them. At the core of it is fundamentally rethinking the interface between user and machine.
With cars it makes perfect sense as long as you do one thing first: throw out everything you've read about fully autonomous cars being right around the corner. If instead we're facing a future of semi-autonomous capabilities which still require a human to oversee and guide -- much like the autopilot controls of airplanes -- then there is a massive opportunity to rethink the automobile interface from the ground up around this new hybrid approach.
You can be sure that Apple's car will not just be a Jony Ive designed Tesla. It will involve a rethinking of the user interface. Apple likes to make a 10X difference when entering product categories and that's been the key element. Effective autopilot assistance features can plausibly get us to 10X improvements in safety and convenience.
Apple's functional organization is one of its secret weapons in applying this philosophy consistently across so many consumer categories and creating a halo effect. I would be very surprised if they changed that for computers-with-wheels.