From Xbox: “Today, Im pleased to share the initial launch line-up of more than 150 games that Xbox Game Pass Ultimate members can play via the cloud in 22 countries starting September 15 at no additional cost. You will find a fantastic, curated selection of games available in the Xbox Game Pass library, including popular Xbox Game Studios titles such as Tell Me Why, Grounded, Forza Horizon 4, and Battletoads, along with favorites from our content partners like Spiritfarer, Untitled Goose Game, and Destiny 2. Similar to Xbox Game Pass for Console and PC, you can expect the library to evolve over time based on members feedback, with new games added all the time.”
Source: N4G PC Cloud Gaming with Xbox Game Pass Ultimate Launches with More Than 150 Games