I hadn't actually read this thread in a while, I didn't realise it was confirmed the cars were outside of the datamine.
That does make me think at least one contemporary race car is going to feature, as those have good reason to not be in a 2022 datamine and we are rather overdue one.
Given that line of thinking, a new GT500 set, or a an updated Ferrari GT3 so they don't have to broadcast a 458 at the world finals are logical choices. But the Brown/Broadbent M4 GT4 is the car that sets off my internal "this is what they'd probably prioritise" alarm. It's a GT4 car entered into a series sponsored by GT, driven by their most popular streamer and their commentator. That's marketing gold, and frankly most other games would probably already have it in and be overdoing the social media tie-ins for it.