"Do the DC characters exist in the universe I created? The answer is yes," Snyder told the Los Angeles Times's Hero Complex blog. "In my mind, we have this fantastic character of Superman. It’s not madness that there would be others. Now, that being said, does a Justice League movie exist now? No. Whether or not I ever get to make that movie, I don’t know. What is real is that there’s a crack — a foot — in the door. That’s promising. The door is definitely open."
The blog also tried to nail down producer Christopher Nolan on whether he might play a role in a prospective Justice League movie, but Nolan was evasive, saying simply that his motivation up to this point had been to create a version of Superman that's as compelling to the next generation of kids as Richard Donner's version was to him.