Earlier today in a Twitter QnA, Johnson had the following to say about the character:
— Dwayne Johnson (@TheRock) December 12, 2014
Shazam has a 2019 release; no other specific details are known including what actor will play the titular hero.
Dwayne Johnson did previously reveal the Shazam movie will not be affected by the Justice League movie or Batman Vs. Superman.
— Dwayne Johnson (@TheRock) November 2, 2014