Here is the actor's Tweet:
Just two weeks ago, the actor couldn't decide who he was playing, the title character Shazam! or his arch nemesis Black Adam. At this time, no further details have been revealed. There is no official director, writer or release date.
Black Adam first appeared in 1945 as Teth-Adam of Kahndaq. He was originally a villain, but slowly transformed into an anti-hero who matches Shazam in strength, agility and fighting. He also knows magic.
Dwayne Johnson has been in talks for the role since at least 2008. It is suspected that Shazam! will take on one of DC Comics already announced 2016 release date. It is not known when shooting will begin.