A number of dataminers have started working on the new v10.31 Fortnite update and have found information from this regarding a possible appearance of a Batman theme in Fortnite.
The dataminers have found information about an explosive Batarang, a Batman Spray, a Batman Grapnel Gun and a Gotham loading screen for Fortnite. There is also a list of different challenges with a Batman theme, by completing these assignments, the player receives the Batman Spray for example.
The Batman game has been hopping on the Epic Games Store for a while. The as yet unannounced game is free to play from September 19 to September 26 as part of their weekly offer of free games. It is not yet known which game it is. The Batman crossover for Fortnite may be dominated by the game that comes to the Epic Games Store. Recently there has also been a crossover between Fortnite and Borderlands to celebrate the launch of Borderlands 3.
If Batman comes to Fortnite, it is possible that this will be announced soon, together with the Batman game that can be played for free from the Epic Game Store from Thursday. There is a chance that more will be shared this week about a possible Batman cameo.