When Warner Bros. announced that “Wonder Woman 1984” would land on the streaming service HBO Max on Christmas, the same time it debuts in theaters, many expected it to be an isolated case in response to an unprecedented pandemic. Instead, the studio will deploy a similar release strategy for the next 12 months. In a surprising break from industry standards, Warner Bros.’ entire 2021 slate — a list of films that includes “The Matrix 4,” Denis Villeneuve’s “Dune” remake, Lin-Manuel Miranda’s musical adaptation of “In the Heights,” “Sopranos” prequel “The Many Saints of Newark” and “The Suicide Squad” — will...