There's no point in saying this, but still gonna go ahead with it. This article contains "spoilers?" for the trailer and possibly the movie. (Seriously, who hasn't seen the trailer yet? Go and watch it, stat.) Here's the link : Batman vs Superman Official Teaser Trailer.
Most of you DC fans must have read the web-comics "Injustice : Gods among us" and are familiar with the premise of the series. For those who haven't, here's a quick recap. Joker makes Superman kill Lois Lane and in turn destroy Metropolis. Superman, in a fit of rage, kills the Joker and takes it upon himself to eradicate all crime from the world. He establishes a dictatorship with known superheroes and villains. He also creates his super powered army to enforce his law.
That army is the main focus point here. They sort of look like this.
Now lets look at the still from the trailer. Notice anything similar?
What I assume (I could be wrong. Nah, probably not.), is that Superman after the events of Man of Steel, wants to keep the world a safe place. But to do so, he has to be at the top. Controlling everything, keeping a watchful eye over the whole world. Maybe his intentions are honest in the beginning, but power can change a man. Even a Super Man. (See what i did there?) He starts believing himself to be above mankind. And starts oppressing the very people he had promised to protect. (I call it the Zod Syndrome. XD)
Obviously, this does not escape Batman's sight. He starts his one man war against Superman. (Reminds me of Injustice.) Probably Aquaman and Wonder Woman join him. Or not. Does it matter? Its BvS. I'm more interested in seeing Superman bleed.
The one thing that that I'm looking forward to seeing more is the Bat Suit. I mean seriously, the suit is awesome. The amount of detail, the inbuilt brooding in the cowl (broodgasm anyone?). And I'm pretty sure I saw the Bat Mobile and the Bat Plane in there too.
And we see Batman is already investigating Superman. Where he comes from? What his powers are. Here's a still of Batman showing off his mad detective skills (too much?) at the subway where Zod got his neck snapped.
We already know the movie takes scenes from "The Dark Knight Returns". Perhaps "Injustice GAU" is also an inspiration. But one thing is for certain. It's gonna be EPIC!!