Originally Posted by The Guard
The obvious answer is SUPERMAN AND BATMAN or BATMAN AND SUPERMAN, but I think this is going to be a much more Superman-focused sequel than people think.
So I'm kind of partial to just MAN OF TOMORROW. It's a logical step forward from MAN OF STEEL, it encompasses the themes of the film, referring to looking to the future, Superman himself and his place in the world and history, to Lex Luthor and his goals, and to Batman and the concept of the emerging superhero which will be the foundation of the DC film universe.
THE WORLD'S FINEST isn't bad...it just doesn't really mean much of anything, and it's a bit dated. I haven't heard anyone say "finest" in a decade.
I actually think "Man of Tomorrow" could work and would be a pretty classy way to go. It would be interesting to see how that title might apply to each of the three main characters. Slap the Bat/Supes logo behind it and everyone will know if features both of them.