https://techcrunch.com/2018/09/26/sony-is-finally-opening-fortnite-cross-play-on-the-ps4/

Cross-play has been one of the biggest selling post for Fortnite, allowing players to engage in the battle royale, regardless of platform. There has, however, been one major holdout — until now. While PS4 have been able to play one another, Sony has been dragging its heels at the seemingly inevitable update.

Today, however, the company is taking key steps toward letting users battle it out, regardless of platform. Sony Interactive Entertainment President and CEO John Kodera announced via blog post that the company is opening up cross-play beta, beginning with the crazy popular sandbox survival game.