It's noted that Batman Vs. Superman will be two parts, with Part 1 "Enter The Knight" debuting October 23rd 2015 and the second part, "Dawn of Justice," premiering in the March 25, 2016 release date.
Obviously, this could be a fake, but there was a previous rumor that Zack Snyder was filming Batman Vs. Superman and Justice League back-to-back.
Maybe Snyder was really filming two parts for Batman Vs. Superman?
The Batman Vs. Superman trailer is also rumored to be attached to WB's premiere of Jupiter Ascending, which hits February 6th.
Is the above pic the final scene from the trailer?
The user who posted the image added:
I have an iPhone video of the teaser trailer (it has updated since, but close with most things), and no, I will never distribute it, but I will offer this screen shot.
Again, take this with a grain of salt, but WB debuting Batman Vs. Superman Part 1 on October 23rd wouldn't be that bad of an idea as there is really no competition on that date (Jem and The Last Witch Hunter), and there is no competition for a couple of weeks following until James Bond Spectre hits on November 6th.
Update: Henry Cavill shoots down the rumor.
"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.