https://www.gamespot.com/articles/fortnite-battle-royale-mobile-announced-with-cross/1100-6457281/

Fortnite: Battle Royale is coming to mobile devices, Epic has announced. Most intriguingly, this is apparently the same 100-player experience, and it will support cross-play for some systems. Thanks to a partnership with Sony, the game will support cross-play and cross-progression between PS4, PC, Mac, iOS, and (eventually) Android. The Xbox One edition does not support cross-play, presumably due to Epic's partnership with Sony.

"Same gameplay, same map, same content, same weekly updates," Epic said in a forum post about Fortnite: Battle Royale's mobile edition. "We believe this is the future of games. The same game on all platforms. Console quality graphics and action. Play when you want, where you want."