According to the Latino-Review, Zack Snyder will tweet the first five seconds of the new Batman v Superman: Dawn of Justice trailer on his Twitter at 9am on Thursday, an hour before the start of Star Wars celebration. Fans will then be able to sign up to view the full trailer in a theater on Monday, April 20th.
Latino-Review also reports, the trailer will be in front of prints of Avengers: Age of Ultron. Most likely the IMAX version.
The film stars Henry Cavill, Ben Affleck, Amy Adams, Laurence Fishburne, Jesse Eisenberg, Gal Gadot, Diane Lane, Jeremy Irons, Holly Hunter, Scoot McNairy, and Jason Momoa
Batman v Superman: Dawn of Justice will open in theaters on March 25, 2016.
— ZackSnyder (@ZackSnyder) April 14, 2015