Very impressive little details, cant wait to try this out!This game has some insane reflection mapping and texture work going on I didn't even notice at first.
The game makes use of a lot of screen space reflections in puddles and in the rain, but it also uses fallback techniques on almost every shiny object in the game. The barrel I'm holding up in this image is reflecting the reflection of the advertisement. The barrel reflects everything around it from NPCs, to you, to weapon fire.
Hard to catch in images, but the building windows in the game use a similar technique to the one Forza Horizon 4 uses on it's building windows called parallax texture mapping. It's a texture that changes the portrayed geometry based on the player's point of view. it gives the illusion of modeled interiors but is simply one of several layers of textures used to make the windows.