The 2nd trailer was kinda "Meh". It basically doesn't show anything I don't already know.
The whole trailer is just the synopsis of this movie.
"Fearing the actions of a god-like super hero left unchecked, Gotham City’s own formidable, forceful vigilante takes on Metropolis’s most revered, modern-day savior, while the world wrestles with what sort of hero it really needs. And with Batman and Superman at war with one another, a new threat quickly arises, putting mankind in greater danger than it’s ever known before."