Landlord

Seems like Bruce lost someone(s) that he loved in the Man of Steel battle, and he + the world, without having any ability to know what happened, are extremely angry and fearful of this insane invincible God that rampaged their city.

Story is that one of the buildings (think it's the one that sees the heat vision blast go through it) is the Metropolis division of Wayne Enterprises. Bruce knew a bunch of people when the building went down. He takes up a vendetta against Superman because of that and decides to take down a threat against humanity. Lex comes in and fans the opposition flames against Superman, and Wonder Woman is probably in the middle working out the Lex angle.

Looks like too much going on for one movie. The cinematography looks lame, compared to Man of Steel. Nothing gave me confidence that Batfleck is going to be cool. That Lex Luthor is more cringey than anything. However it does look more promising than Man of Steel, overall.