The film was set to go into production earlier this year but the studio shelved the project during the WGA strike because the script was in need of a rewrite.
Director George Miller (Mad Max, Happy Feet) is currently preparing the film for production in Australia.
The movie follows DC Comics' top superheroes as they unite to form the crime-fighting Justice League.
Adam Brody (The Flash), Common (Green Lantern), Armie Hammer Jr (Batman) and Megan Gale (Wonder Woman) are all expected to star.
The studio yesterday announced a May 22 release date for the next Terminator film. Where the Wild Things Are and Watchmen are the only other films that Warner Bros has scheduled for that year.