https://www.gamespot.com/articles/ps4-cross-play-is-finally-real-fortnite-beta-is-li/1100-6462053/

Sony has announced that cross-play between PlayStation 4 and other platforms is coming to Fortnite. In a statement posted on the PlayStation Blog, Sony Interactive Entertainment said it has "identified a path towards supporting cross-platform features for select third-party content." The first of these third-party titles is Fortnite, and an open beta has begun that allows for "gameplay, progression, and commerce" across PlayStation 4, Xbox One, PC, Nintendo Switch, Mac, Android, iOS.

"We recognize that PS4 players have been eagerly awaiting an update, and we appreciate the community's continued patience as we have navigated through this issue to find a solution," said John Kodera, president of Sony Interactive Entertainment. "We see the beta as an opportunity to conduct thorough testing that ensures cross-platform play is best on PlayStation, while being mindful about the user experience from both a technical and social perspective."