https://wccftech.com/metro-exodus-nvidia-hairworks-physx/

Earlier today, German website PCGamesHardware published a lengthy report on Metro Exodus, delving on both the game itself and its technical features (including performance, of course) as they were experienced during the demo available at Gamescom 2018.

Interestingly, as mentioned in the title, they were the first to confirm two additional NVIDIA features (on top of the already announced and showcased ray tracing) in Metro Exodus: HairWorks and Advanced PhysX.