Apparently Zack Snyder (Batman V Superman) and JJ Abrams have been having some weird cross-over twitter battle - between the two of them there have been pics posted of superman with a cloak and lightsaber, C-3PO (The C3Ped Crusader) standing watch over Gotham, GCPD officers arresting a stormtrooper, Batman and R2bin, etc.
Check out the twitter feeds (@ZackSnyder, @bad_robot) for a look at them. I guess this video was the latest round of Batman vs. Star Wars thing they have going on...