Ben Affleck says Justice League is about hope and teaming in new image with him (Batman) and other members of the League:
This is a step in evolution to bring together all of these characters who have had their origins. It’s about multilateralism, and it’s about hope and about working together and the kind of conflicts of trying to work together with others. Part of the drama of the movie is the question of whether or not the team is going to come together. It’s very different from the tenor of the last movie and there’s also more room for humor.
See image below