Personally, i'd like to see 1 or 2 more Australian tracks appear in the game at some stage. Possibly tracks that aren't seen very often in other games.
But if the S4 team are going for authenticity and adding tracks that the classes/series in the game have actually raced at in the past, then i don't think we have many options over here, lol. All that comes to mind from an international perspective, is the Phillip Island Circuit, and The Bend Motorsport Park (our most recent track to be built) Pretty sure i've seen an international race held there in the past. Google tells me a round of the Asian Le Mans series back in 2020.
Adelaide Parklands street circuit has hosted F1 back in the day, before they re-located the event to Albert Park.
I have a feeling the Viper GTS-R could be in the game, as i'm certain i've seen it in a very early screenshot way back when the game was first announced. (and for the life of me, i can't seem to find it now) But, i could be wrong. Someone correct me if i am. Or agree with me if you also saw the screen i'm talking about..
*According to the first page of this thread, the Viper has green text and has been confirmed.