WB revealed the new costume toward the end of the day as part of the Batman 75th Anniversary display which features the various costumes of Batman from the movies and TV.
Batman Vs. Superman hasn't officially been announced to be part of WB's Hall H plans on Saturday, but similar to last year, it's thought fans are in for a super surprise.
"Batman v Superman: Dawn of Justice" has a newly announced May 6, 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.
For more news on the "Man of Steel" and related movies head on over to the Cosmic Book News Superman movie hub.