There are a lot of things that hit me about the trailer:
-Superman's isolation, even in crowds.
-Of course they would save Zod's body!
-The Joker's presence is very strongly felt, especially with Robin
-I still don't like Eisenberg as Luthor, but I can see him now as an extension of his Zuckerberg performance in The Social Network.
-Wonder Woman looks awesome.
-Batman has been doing his thing for 20 YEARS!
-The world's reaction makes complete sense.
But for me, the most powerful part was seeing the events of Man of Steel from Bruce Wayne's persepective. This film is meant to be Batman's introduction to the DC Cinematic Universe and this is the perfect way to do it. It is visceral and emotional. Visually its stunning to see the two Kryptonians fight from "street level." This perfectly captures the difference between the heroes: Superman looks from above and Batman sees things from below.
And that long shot of Bruce running to the danger in the beginning...
Director Zach Snyder captured the look and emotion of 9/11. And in the midst of that, while everyone else is running away, we see Bruce running head-long into the danger.
That gave me chills.