I think the game is not anywhere near ready yet. It seems it's an Q3 - Q4 launch, judging by some screenshots. Laguna Seca especially looks Beta.
Background on the right looks unfinished.
In this picture we can see how the lightning is much better than before, much more natural, and how the cars fit right into the environments. Also, we can see awful background textures on the upper right hand, bad 3D models for the crowd and spectator cars, and on the left, bad shadows.
This is not anywhere near the best looking game to date yet as some were saying. Maybe if they fix all these (imo old build) problems, it can stand a chance. I'm worried that for RT/60 gameplay they needed to cut some corners, but I think/hope it's just a case of an old build showing in these trailers. Also, GT7 had a similar problem with one of its trailers - they showed some awful looking trees that were improved upon launch.