The scene in BvS where Batman sees future Flash has prompted a lot of debate online, but there's a question I haven't seen addressed yet. The "nightmare" that Batman had of a Superman gone bad would seem to be the fruition of all his concerns regarding the Kryptonian. Assuming that Flash caused the nightmare, it begs the question of whether that was an actual glimpse into the future (presumably the one that THAT Flash came from)... or if it was a just a nightmare Flash used to get his attention for the message he gave. I know there are lot of extra scenes in the Ultimate Edition cut, but I haven't seen that cut yet.
Has Zack Snyder or anyone involved with the production of "Batman vs. Superman" commented on whether this was an actual glimpse into a possible future?