There have been many rumors about the movie Batman vs. Superman: Dawn of Justice. We've heard anything from Jim Gordon being dead to Doomsday being the main enemy. While these seem possible it is very unlikely that this will happen. Let's hash through 3 of them!
1. Jim Gordon Rumor
The rumor is that a major Batman character is already going to be dead and many speculate that its Jim Gordon. The reason this is very unlikely is because Batman vs. Superman is based off of Frank Millers The Dark Knight Returns. And for those of you that have read the comics or watched the animated movie know that Jim Gordon is alive.
If this rumor is true then it would make more sense for Jason Todd to be dead. In the Dark Knight Returns they reference Jason Todd's death, so it would make more sense that he would be the major Batman character that is dead.
2. Doomsday Rumor
There is a very popular rumor that Lex Luthor get a hold of General Zod's corps and uses the DNA to make Doomsday. I don't understand why this rumor would be so popular since it makes no sense what so ever. Introducing Doomsday this early does not make any sense, however it would make more sense if Lex Luthor got ahold of General Zod's corps and used the DNA to make Superboy.
3. Why SuperBoy makes sense
The rumor is very close to the origin of SuperBoy. His exact origin states that he was created from the DNA of both Lex Luthor and Superman. So in [Batman v. Superman: Dawn of Justice](movie:711870) they could be going for Lex Luthor's DNA and Kryptonian DNA and it would make sense. If SuperBoy is actually introduced we could be getting a Teen Titans movie in DC's Phase 2 movies, since Cyborg has already been confirmed for the universe.