There’s a reason you haven’t heard much about Shazam, the film that will star Dwayne “The Rock” Johnson as the anti-hero/antagonist Black Adam: there’s simply not much to tell at this point. The film, in development for a current release of April 5, 2019, doesn’t have a finished script yet.
In a Heroic Hollywood podcast, they said the script draft is still being waited on by Warner Bros. Until the script comes in, despite the general idea of the characters and The Rock’s involvement, they’re holding off on trying to find a director.
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Dwayne Johnson’s very early signing for the film may indicate a cameo coming in an earlier film, or could have simply been WB trying to grab him before Disney/Marvel Studios tried to for one of their superhero franchises.