Still not 100% sure that Manhunter is guaranteed to be in the game. Aquaman is pretty much confirmed. Raven is in the game, but not confirmed as playable. I'm still betting on Shazam since his artwork was found.
Shazam wasn't confirmed. He was mentioned in a magazine article. If we went for magazine articles as confirmations, then we could immediately say Raven, Ares, and Black Adam are in for sure.