Batman is going after Superman because he's a threat to the world.

Superman is going after Batman because he's a reckless vigilante.

The fight is real. The reasons are valid. We don't know why Wonder Woman is there yet but she's there and she's kicking ass!

The trailer gives us everything we could ask for by delivering a little more of the story, quotable quotes and all the action they can stuff inside of a 3+ minute trailer. It seems that while Batman's reasonings seem understandable, even his butler, the devoted Alfred, tries to convince him that Superman is not the enemy. Wise words from Ma Kent to her son reminds him (and us) that Superman owes nothing to mankind. I'm going to need some time to let this sink in, so for now, enjoy the trailer. I know I'm headed back to watch it again! And again...and again...and again...and again...and again...