https://www.gamespot.com/articles/all-the-xbox-one-x-enhanced-games/1100-6452676/

The upcoming Xbox One X will be the most powerful console to date, and Microsoft has released a full list of games that will feature Xbox One X enhancements. Aaron Greenberg alluded to the list during a livestream at Gamescom 2017 and mentioned Quantum Break and Halo 5: Guardians as key games to receive optimizations.

Every game that gets the Xbox One X enhancements will receive the updates for free, which can include--but are not limited to--4K resolution (checkerboard or native), anisotropic filtering, HDR, and high-resolution textures. However, developers decide how their games take advantage of the more powerful hardware.