There have been reports that reports all over the internet about a hidden easter egg towards the beginning of I Am Legend where Batman and Superman logos, along with a 5.15.10 release date are seen by vigilant viewers.
Some people think it is a cheap form of marketing to place an easter egg in a movie and insinuate a possible future movie project and see the hype it generates all over the place.

It is a common sense that Batman can take down superman just as easily as Superman is able to take down batman. But if the movie Batman Versus Superman or the Superman versus Batman is to be made, most likely they would both be in the same team. The upcoming Justice league movie is to be recalled.

The release date of the movie Batman versus Superman is yet to unfold, yet alone that fact that even the movie itself is real. Most likely it will be a summer tentpole release. We all saw the hype and how web and media went about Batman versus Superman in summer 2002.