Isetta style front hatch would be very cool.
Realistically, I when this gets productized, it will be a feature on regular looking cars, not a car in itself. This is just a PR piece. Think of it like the Mercedes that can parallel park itself and has radar controlled adaptive cruise control and automatic breaking and lame change notification. This will just be the next step on the 20xx model.
Also, the infrastructure costs on building a duplicate road system would be crazy. They will likey drive on regular roads with mixed traffic so they won’t be legal until their real time adaptation of unpredictable moving objects around them is perfected.
Now, thinkin how to game the system. Imagine these cars automatically dynamically react to vehicles and other moving objects around them, and there is a traffic slow down. If hypothetically a fast moving Audi that is full manual approaches from the rear at a velocity much faster than the autonomous car, will it automatically pull over to the side of the road and get out of the way? If so, the manual commute just got more fun. 