Things were apparently so secret when Jason Momoa went to audition for Zack Snyder before Batman v Superman: Dawn of Justice that the actor had no idea what role he was auditioning for.
Momoa says he’d been told he was auditioning to play Batman, but even he knew that wasn’t true, leading him to believe he was probably auditioning to play a bad guy.
Spoilers have the potential to really damage a film’s success, and so major blockbuster productions especially like to keep things close to the vest.