Shannon has since come out and said he made it all up, and now while talking with Screen Rant says more of the same, but does offer a "no comment" when questioned if he actually has more of a role than the body bag scene depicted in the trailer.
Flippers? I think that might be a prime example of my scatological humor. People ask me a lot about Batman v Superman and I really don’t have anything to say about it, so sometimes I just make up stuff, which I’m sure Warner Bros. is really happy about.
I run for President (laughs). Uh, no, you know, I think it’s better left unsaid. I mean, when does the movie come out?
Yeah, I don’t want to spoil it for anybody. Yeah, no comment.
It's speculated Jesse Eisenberg's Lex Luthor gets a hold of Zod's corpse and experiments with it, perhaps creating the Luthor Warsuit from the comics or maybe even one of the above mentioned Superman villains.
"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 as Senator Finch and Tao Okamoto as Mercy Graves. Justice League is to follow directed by Zack Snyder as well.
Fearing the actions of a god-like Super Hero left unchecked, Gotham City’s own formidable, forceful vigilante takes on Metropolis’s most revered, modern-day savior, while the world wrestles with what sort of hero it really needs. And with Batman and Superman at war with one another, a new threat quickly arises, putting mankind in greater danger than it’s ever known before.
Batman Vs. Superman Comic-Con Trailer: