This is, without a doubt, AWESOME casting! As someone who has long wanted to see this project come to fruition, I'm ecstatic! The only thing that would make me happier is if Mr. Johnson would play both Black Adam and Captain Marvel. Will it happen thought? Probably not.
Also, I highly doubt that SHAZAM will be part of the DC Cinematic Universe. ANYWAY...
Darren Lemke is writing the script. The Rock's Black Adam, who DC's New 52 reboot, is more of an anti-hero trying to clear his name than a villain. Mr. Johnson Hiram Garcia are also producing. The project is said to be on the fasttrack at the studio.
Now, the next big questions are...who will play Billy Batson and Captain Marvel/Shazam? Stay tuned!