Read the Full StoryA fan on Vero posted the Batman v Superman photo above and said that he never noticed the crosses in the background before. Zack Snyder replied and said, “that’s a reference to Justice League 2”. He then added “until it wasn’t,” likely referring to the movie’s cancellation.
Zack Snyder reveals ‘Batman v Superman’ easter egg for the canceled ‘Justice League: Part 2’
From Batman News: