Looks like Aliens: Fireteam Elite is coming to Game Pass on Dec 14.
I held off getting it for a while after some friends bought it so this has saved me the full price of the game. Yeah, these kinds of coop games are perfect for the social element of Game Pass where all your friend automatically have the game at the same time.I remember thinking when this came out, it would've made the perfect Game Pass launch lol. Glad I can suss it out!