Busty
Highway Hunter
Side view cameras will be an option. But I don‘t know if this will be in all markets.
I guess they are legal in most markets. In some of the more 'cautious' markets (like Germany), cars with camera-based rear view systems needed a special permit at registration. Hopefully, Audi dealers will take care of that part.
What I'm more concerned about is the position of the screens in the door. This will take quite some time and effort to really get used to. In my opinion, this is pseudo-high-tech. In sum, such solution offers no real advantage in contrast to conventional mirrors (quite the contrary). And please spare me the fuel consumption argument ...
