GameStop Germany has listed both Beyond Good & Evil 2 and a new Batman game for Xbox One and PlayStation 4.
A user on NeoGAF notes that this is the same retailer that outed Tomb Raider: Definitive Edition before it was formally announced.
Ubisoft's Michel Ancel has hinted in the past that a new Beyond Good & Evil was in the works for next-gen platforms, and Warner Bros. has made it clear gamers will see plenty more of the Caped Crusader in the future, so there's a good chance these listings are legit. That said, we'll have to treat this is mere rumor for the time being.