I had read rumors about Lex taking the corpse of Zod and turning him into Doomsday and I had genuinely hoped that was not what they were going to end up doing. Well, turns out that IS what they are doing. Turns out that when Michael Shannon slipped about being in the movie and then they had to back-peddle, it was really the truth - the "flippers" he said he had for hands were probably appendages they put on his arms for the motion capture process, to track more accurately where the longer arms of Doomsday would/should be... *sigh*
The trailer did nothing to change my opinion that this movie will be a whole lotta "meh".
In stark contrast when I saw the Captain America: Civil War trailer, I was blown away - that moment near the end when Steve says "I'm sorry Tony, but he's my friend" and then Tony says "But so was I..." and then the two-on-one fight with Steve, Bucky and Iron Man summed up everything we needed to know about the movie and conveyed the dramatic weight of the conflict between Cap and Iron Man perfectly.
When it comes to Batman v. Superman, I still just think to myself "who cares?" - we have never seen these two guys work together so why couldn't they start off hating each other initially. There was the brief Iron Man/Cap/Thor fight in the first Avengers movie but emphasis on BRIEF. So if the "versus" part of Batman v. Superman is really only a small part near the beginning with the majority of the film centered around the heroes having to put their differences aside, team up with Wonder Woman and fight Doomsday, I think a lot of people are going to feel mislead considering the name of the movie implies it would be about Batman versus Superman.