Unpopular opinion alert.
I really hope ACE's focus is mainly on road cars; modern and classic. Adding tuned or cup versions is welcome as well.
This was where the original AC excelled, in my opinion, as its physics engine and feedback allowed one to really feel, explore and enjoy the differences between each model.
Another way to look at it is being more of a driving simulator rather than a racing simulator.
I don't wish to see the car line-up filled with GT3 or even GT4 cars, especially since we already have ACC for that (with its more competitive approach).