They promised with last-gen Xbox One, and have followed it up, that all first-party games that launch for Xbox will also launch for PC. (Originally this extended to all games, but some late releases were xbox-only.) There are no xbox-only games for Xbox Series announced, from any publisher, that are not available for PC.
Microsoft's Xbox+PC strategy is pretty much taken for granted now, "exclusivity" between Microsoft and Sony now means "just Xbox and PC" or "just Playstation (and sometimes PC)."
