Batman v Superman is obviously one of the most anticipated movies in Hollywood, and everyone is expecting it to make bank. It is a superhero movie, after all, and one with some really big names. There are rumors going around that Warner Bros will split it into two films—presumably, to make more money. Hunger Games did it. Harry Potter did it. Twilight did it.
Somebody posted a grainy photo that is supposedly from the teaser trailer that will run February 6 before Jupiter Rising, which shows two names and dates: "Part I: Enter the Knight" on October 23, 2015 and "Part II: Dawn of Justice" on March 25, 2016.
At the moment, Warner Bros. is saying "no comment," but it would make a lot of sense, and possibly a storyline stretched out way too far.