HBO Max subscriptions doubled when Wonder Woman 1984 was released in December, but the streaming service could be in for another massive increase in “activations” soon. On Friday, HBO Max announced that Zack Snyder’s Justice League, a.k.a. the Snyder Cut, will “exclusively” arrive on March 18. It will be released as a four-hour movie with loads of “previously unseen footage,” not four one-hour installments as initially reported.