A bunch of new rumors from "A friend of a friend who says they saw the script", so take it for what it's worth. They contradict some of the earlier rumors, but also sound pretty plausible, and actually pretty cool.
- Brainiac is the secondary villain; Luthor discovers how to use the Brainiac AI to control Superman, leading to the fight between Superman and Batman.
- Earlier rumors stated that Luthor was experimenting with Kryptonian DNA and would in turn create Doomsday. This batch of rumors state that instead, Superboy and Bizarro are the end result of experiments merging Superman's DNA with Lex's and Zod's, respectively.
- Luthor's battlesuit based on Kryptonian battle armor may be in the movie, but whether or not he actually uses is it unclear.
- Batman retired because the Joker killed Jason Todd seven years earlier, and although he isn't seen, it's hinted that Grayson as Nightwing is active in this universe.
- Barbara Gordon as Oracle works as a computer tech for the GCPD and is an assistant to Batman. Contrary to earlier rumors, this batch states that Jim Gordon is not dead, simply not present in the film.
- Luthor's master plan involves having the President of the US assassinated for his pro-Superman stance. This possibly hints at Luthor plotting his own run at the White House.
All of these are highly plausible, but again, so are all the other rumors. The biggest thing that strikes me, is how they contradict the Doomsday rumors from earlier. What I *think*, is that a little of all of it may be true, and some of the "leaks" may actually have been things that are instead planned for the Justice League movie. So I think both Brainiac and Doomsday are extremely likely to appear, but not in the same movie. I think one of them is going to be the villain in BvS, and the other one will be the villain in Justice League.
Interesting stuff. If even any of this stuff is true at all, I once again have to give them a ton of credit for sticking so closely to the source material.