The title was previously given a vague "spring" release window. However, US retailers Amazon, Best Buy and GameStop have all specified the May 21 date for the game. Joystiq has confirmed GameStop's listing is genuine.
Lego Batman 2 on Wii U will be enhanced to support off-screen play on the Game Pad, touch screen controls, and will have tweaked maps.
Last month it was rumored Batman Arkham Origins is reportedly in development at Rocksteady Studios for current and next gen consoles. An unnamed industry source seemingly confirmed earlier reports that the title will be a prequel inspired by the Silver Age of comics.