James Gunn said

James Gunn says he knows whose history is told in the current DCU, and it is not the one we could expect. Speak to ScreenGunn explained that there is a similar character in the heart of the new DCU than he feels that it is ultimately Rock's journey, but we could be surprised who it is actually.

“Yes, I don't think it's crypto's story,” jokes Gunn when he is asked whether Superman's dog could be the main connective tissue of the new DCU. “I think I know whose story is, and it is probably nobody that someone would ever expect.”