Batman vs SuperMan Poster!

Today a reader emailed me to spill the beans on something very cool. Apparently there is some subtle advertising for Batman vs Superman in Will Smith's I am Legend. I have not seen the movie yet and can not confirm this but the reader says quote;

I don't know if you have seen I am Legend, but in the movie Will Smith is in the year 2009 and walking around New York.  In the movie you can see a large movie poster for Batman Vs Superman movie.

Batman vs Superman would be an epic film but I am not quite sure how Batman could possibly stand a chance against Superman. Perhaps I have some comic reading to do.