Developer Larian has confirmed that Baldur’s Gate 3 will be getting cross-play, though the timeline on when exactly it will release is a little fuzzy.
Larian’s director of publishing, Michael Douse, told Eurogamer that the game was always intended to have cross-play. Douse said, “It was always in the planning, but we knew it wouldn’t be for launch. It’s in the roadmap, and though we have an idea of when we’d like to get it ready for, we don’t want to put a date on it until we’re sure.”
Basically the feature is coming, it can just be tricky to implement–especially since the team hasn’t yet launched the final version of the game. Still, like the Xbox port, it’s only a matter of time.