He explains that Lex Luthor (Jesse Eisenberg) is going to be the primary antagonist, like Grand Moff Tarkin was in Star Wars. Many people would say Darth Vader was the main villain of Star Wars, but he was actually more like the muscle. Batman v Superman has its own muscle, and that is Doomsday's role in the film.
This is not the first time we have heard that Doomsday will be in the film. We, ComicBook.com, actually reported on this back in January and have some major spoilers regarding how he appears in the film, which is very different from his comic origin. You can read that by clicking here.
My own sources have informed me that Doomsday will be a blend of practical and computer-generated effects.
El Mayimbe then goes on to say the "Tell me... do you bleed?" portion of the Batman v Superman footage is actually from a "dream sequence."
You can listen to it at the 38 minute mark.
Zack Snyder's Batman v Superman: Dawn of Justice is in theaters March 25, 2016.