I, as well as may many of the NVIDIA GeForce NOW users, are waiting for Nvidia adding new games. Some of the preferred games were already…
medium.com
Unlocking GeForce NOW gives you access to their database for testing and you can find unreleased games like:
God of War, Returnal and Demon Souls for PC
No mention of PS4's Spider-Man or Bloodborne for PC
GTA 3, Vice City and San Andreas Remasters
Some unannounced GeForce NOW games like Mafia: Definitive Edition
Even the new Uncharted Collection for PC (with its complete name) and Alan Wake Remastered are there
All new PlayStation Games (IMPORTANT! If it doesn't say Steam/Epic at the end it might just be a GeForce NOW/PS NOW crossover for testing (since PS NOW is also on PC))
IMPORTANT! You can check fake geforce games here, this list was provided by Pavel. There are a few games showing up that sound more like placeholders then actual games (Bioshock RTX Remaster, Batman: Arkham Knight RTX Remaster, Mirror's Edge RTX Remaster).
It is important to say that whatever shows up here, isn't a 100% confirmation for a PC port. Seems like most of the games here are just for testing and all of this could be a collaboration between Sony (PS NOW) and Nvidia (GeForce NOW). Games like God of War however explicitly mention Steam with the right publishing lable aswell as a STEAM ID entry. These games are probably legit.