Tonight saw the Batman Vs. Superman trailer screened in select IMAX theaters in addition to fans getting some super swag.
Below you can check images of the swag, which includes the Batman and Superman posters as well as a free pass to an advance screening of Batman Vs. Superman.
Regarding the extra footage Batman Vs. Superman IMAX trailer footage, what was shown was Batman (in the armored suit) and Superman running toward other with fists clenched and as they were about to meet, it cut away to the Batman Vs Superman logo title.
Update: Zack Snyder also appeared in the footage thanking fans for coming to see the trailer how it was originally intended to be seen and said the additional footage will not be a part of any other trailer or released online or viewed before other movies (thanks to Andre Lashley on our Facebook for the info).
Update: #2: The footage has landed online.
We're guessing it's probably something similar to the scene from The Dark Knight Returns comic minus the punch:
"Batman v Superman: Dawn of Justice" has a March 25, 2016 release starring Ben Affleck as Batman, Henry Cavill as Superman, Gal Gadot as Wonder Woman, Amy Adams as Lois Lane, Laurence Fishburne as Perry White, Diane Lane as Martha Kent, Jeremy Irons as Alfred, Jesse Eisenberg as Lex Luthor, Ray Fisher as Cyborg with Callan Mulvey, Holly Hunter and Tao Okamoto in new character roles for the film. Justice League is to follow directed by Zack Snyder as well.