I like Ben Affleck, I like him as an actor, I respect his work as a director, and he seems like a nice enough guy. But to my knowledge he's never directed scenes that would later include large amounts of CG; and planning a shot around what isn't there is a lot harder than it sounds.
In my mind this doesn't bode well.
Also Batman going to have to be rebooted to be included; Nolan's Batman has no place standing next to Superman (unless he becomes Justice Leagues' Rorschach, then again Nolan's Batman didn't do a lot of detective work so he still wouldn't fit).