Billy (assuming he is Billy Batson) looks pretty different in the Previews for the Curse of Shazam backup by Geoff Johns and Gary Frank.
I have a theory that hes not only Billy Batson but also Freddy and Mary and other characters combined. This "Billy" as seen above looks like an adult or atleast a college student (Taller than those people in panel one, wearing clothing associated with people in that age group). My Theory is that the Wizard, when giving him the power of SHAZAM splits this "Billy" into the characters we know (Billy, Freddy, Mary, etc). This would be similar to Flashpoints Captain Thunder where it takes a group of kids to create Shazam. This could be what Geoff is trying to do, or atleast the twist that people would get angry over that he keeps talking about.
Tell me what you think. Possible? Crazy Talk? Blasphemy? Or the coolest thing ever?