Since Warner Bros. first announced that the title of their Man of Steel follow-up would be Batman Vs. Superman, fans have wondered just what the two would be fighting about, and how much of the movie that would take up versus how much will be spent actually fighting bad guys.
People have speculated that perhaps the confrontation would come when Batman got wind of all the destruction Superman's fight with Zod caused in Man of Steel. But apparently it really was just speculation, if this new report is true, the real motivation for the fight is actually more interesting.
POSSIBLE SPOILERS AHEAD
This comes courtesy of Devin Faraci of Badass Digest, who's been following the film very closely. According to what he's learned, here's how it all begins:
"It is Superman who goes to Gotham and starts the confrontation... at the behest of Lex Luthor. And unlike The Dark Knight Returns, Superman comes out swinging, pulverizing the Batmobile with one punch. Why would Superman do Lex Luthor's bidding? What is Lex hoping to accomplish? That would be spoiling. But know that when the fight is over, Batman will be able to point to Superman and say, "He started it!"
So Lex Luthor sends or sets off Superman, which means he's got his claws in Superman, whether Superman knows/likes it or not.