As previously mentioned, Grand Theft Auto: San Andreas - The Definitive Edition is a remastered version of the highly-rated game which first released in 2004, and it's being included as part of a bundle alongside Grand Theft Auto III and Grand Theft Auto: Vice City.
The remastered trilogy features a bunch of enhancements including higher resolution textures, a completely rebuilt lighting system, improved water and weather effects, improved gunplay and targeting controls, the ability to immediately restart a failed mission and much more. Plus, it's been confirmed to run at 4K, 60fps on Xbox Series X.
Here's how Rockstar describes it:
"Play the genre-defining classics of the original Grand Theft Auto Trilogy: Grand Theft Auto III, Grand Theft Auto: Vice City and Grand Theft Auto: San Andreas updated for a new generation, now with across-the-board enhancements including brilliant new lighting and environmental upgrades, with high-resolution textures, increased draw distances, Grand Theft Auto V-style controls and targeting, and much more, bringing these beloved worlds to life with all new levels of detail."