The trailer definitely looks to be building us up for one hell of a final battle. We'll probably get a Batman v Superman v Wonder Woman v Dungeon Troll Doomsday v ... and so on. I mean we still haven't gotten footage of Flash, Aquaman, Cyborg, or Green Lantern. Though, to be fair, they'll probably be minor cameos at best- maybe even a just a small post credits sequence.
I'm keeping my fingers crossed that this turns out to be much more well written than Man of Steel, which was good despite it's flaws. It already looks better, but trailers aren't always indicative of substance- take Snyder's Sucker Punch. It was a brilliant trailer and a downright horrendous film. He tends to put style over substance. Though, in this case David Goyer is helping with the writing...
...then again, while Goyer did write the Nolan Batman Dark Knight films, he also did Man of Steel and Ghost Rider: Spirit of Vengeance and we all know how that last one turned out.
Batman v Superman: Dawn of Justice hits theaters March 25th.