Re: A hypervisor to do what?
A hypervisor in a car would serve the same purpose as a hypervisor in a games console - it allows code to run in its own little box with little or no access to code running with a higher privilege or in a different box. So that even if someone managed somehow to hack / root the infotainment system, it wouldn't provide them with access to other critical systems in the vehicle.
Given the number of stories about remotely hacked vehicles and the increasing use of over the air updates, phone apps etc., this would seem like a sensible thing to add.
That said, I could see how even hacking the infotainment system could screw with a car. Most systems would have control to functions like door / boot locks, fuel cap release, air conditioning, volume controls, bluetooth, gps etc. then there are still opportunities to grief the car, remotely open it, listen to conversations, track its location etc.