News of this flooded Reddit and other social media platforms days ago but until now it wasn't verified.
Epic appears to have quietly enabled cross-platform play between Xbox One and PlayStation 4 in Fortnite. A quick search confirmed the player in question was on a Xbox and not a PC. Now, Fortnite developer Epic Games says that feature was actually a bug, which the studio is referring to as a "configuration issue" that it says it has fixed. "We had a configuration issue and it has now been corrected", is what Epic stated, meaning this issue wasn't an act of defiance or anything malicious. This discovery was reported by multiple PS4 players on Reddit, after they spotted spaces in the names of players they interacted with online.
Microsoft has been pushing for cross-platform play in recent months.
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Over the weekend, a number of Reddit users posted evidence of players from other consoles showing up in their Fortnite games, including a father/son combo playing on two different consoles in the same room. This whole saga first began when Rocket League developer Psyonix suggested that enabling cross play between the two consoles would be a simple endeavor, with Sony turning around and denying such a move.
So, assuming all of this is legitimate and not just some massive mix up, it would appear that cross play has indeed been enabled in Fortnite.
Fortnite lets PC and PS4 players game together, but has announced nothing more with regard to cross-play. While Microsoft is up for it, Sony remained cold to the prospect as of spring 2016.