https://www.polygon.com/2018/8/30/17800128/xbox-game-pass-games-september-2018-halo-master-chief-collection-quantum-break-onrush-xbox-one

Quantum Break and Onrush will join Halo: The Master Chief Collection in the library available to Xbox Game Pass subscribers in September, Microsoft announced today.

Other titles added to the service are Shadow Warrior, a reboot of the 1997 original; Giana Sisters: Twisted Dreams; Sky Force Reloaded; Manual Samuel; Snake Pass; and InnerSpace. More about the games can be found on the Xbox Wire announcement.