That would be revolutionary, but...The "revolutionary" part would most likely be the autonomous driving tech.
Just to calibrate the expectations agains the real world: There are some SAE Level 3 autonomous vehicles available. Audi A8 was the first one two or three years ago, but Audi actually withdrew it. Just right now some manufacturers are making their level 3 cars available. M-B and BMW are rolling out theirs in Europe, Hyundai/Kia in South Korea, and Honda in Japan. In the US, the most likely candidates for level 3 are Tesla Autopilot and Cadillac SuperCruise, but the schedule remains uncertain.
Level 3 means the driver may take their eyes off the road and the car will warn well beforehand (10 seconds) if driver intervention is needed. The functionality is restricted to certain geographic regions and conditions. It seems that all level 3 cars have a similar set of requirements: available on select highways, under 60 km/h (37 mph), over +4 °C (39 °F), no adverse conditions.
Level 4 (driver may take a nap, but the functionality is geographically and/or otherwise limited) is coming within the next few years, but it will be very limited geographically and otherwise. Getting to the "drives autonomously majority of the time spent in cars globally" phase takes several years, probably more than a decade.
Achieving real FSD (level 5, no driver) will take decades, and it requires large systemic changes in road traffic.
Everyone knows an autonomous car would be very, very, very lucrative for its manufacturer. Nobody knows how to make one. This is a field where billions of currency units are used to fuel the R&D, and it is a field where some of the brightest people on the planet are dedicated to find the answers.
So, what would be Apple's competitive edge in autonomous driving? My guess is that Apple is aiming at a well-designed state-of-the-art EV with highly polished user experience. The car will be loaded with electronic aids, but it will not bring anything technologically new. Remember, Apple very seldom introduces anything really new. iPhone was not disruptive because it would have been the first touchscreen phone — it wasn't — but because it offered a (relatively speaking) great user experience or users and developers.