What do you think a rebirth series will entail, and what do you want from a rebirth series featuring the World's Mightiest Mortal?
What I expect DC will do: still call Billy Batson's hero guise "Shazam".
What I want DC to do: I want the kids (Billy, Mary, Blond Freddy, Pedro, Darla and Eugene) to be the "Marvel Family", bring back the Lt. Marvels, but as depicted in "Thunderworld Adventures" (led by Uncle Marvel), have Billy begin his training as a magic user (if he is to be the "new" Shazam, which is a title that guardians of the Rock of Eternity have), and just be used more often other than window dressing.
IMO, of course.