Per a report from EW, it looks like Blood Diamond star Djimon Hounsou will appear in Shazam! as the Wizard who grants Billy Batson (Asher Angel) the powers to turn into the titular hero (Zachary Levi).
Hounsou has apparently been cast for quite a while (as production on Shazam! has already been completed), but his involvement in the movie had not been made public until now.
Previously, it had been reported that This Is Us star Ron Cephas Jones had signed onto Shazam! as the Wizard (and some fans had even begun making fan art of the actor in the role), but Jones ultimately had to turn down the part due to scheduling conflicts.