We saw from the sneak peak that batman was held prisoner by superman in a possible dream sequence. And that was cool enough in itself but in the newest trailer,we see more of a glimpse of batman fighting superman's solider's.
Obviously batman is successful in subduing his captors but in the back you see what seems to be parademon's.They could be picking up soldiers or prisoners that batman was with, i don't think they are working with batman. It seems like an every man for himself situation, but it is very illuminated in the back which could be a boom tube like in the cartoon. At first I thought this could be a dream of batmans fears, but of these are parademon's. Itcould be a vision that was implanted in his head.who would put that in his head, darkside himself or maybe one of his agents.