Epic Games announced that Fortnite: Battle Royale will get mobile release. And it will support cross-play, cross-progression and cross-purchase between Xbox One, PC, Mac, iOS and Android.
But, as usual, Xbox vs PlayStation is not happening. Which means Xbox One players can play with PC, Mac, iOS and Android and PlayStation 4 players can play with PC, Mac, iOS and Android. But Xbox One with PS4 is not available.