Today the guys over at Batman-on-Film (They broke Batman was going to be Older) dropped a small almost obvious tidbit on Batman vs Superman. According to their source Batman vs Superman is going to indeed have 2 villains and neither will be from Batmans Mythology:
This is basically obvious given that I don't see us getting another Superman movie with Lex Luthor being the sole adversary...he needs a hard hitter to bring together the Worlds Finest. Now rumors from some sites have been circulating that Doomsday may appear in Batman vs Superman alongside Lex. While other websites are reporting that Metallo is the 2nd villain. That's all up in the air at this point but at least we both those choices are great!
As much as I want to see Superman die from the hands of Doomsday; Metallo makes way more sense being alongside Lex Luthor.
Batman vs Superman smashes into theaters July 2015