This is one of the most intriguing rumors that I have seen lately about Zack Snyder's Man of Steel. Apparently, the Cosmic Book News is reporting that they were tipped that Bradley Cooper (The Hangover) is going to be doing a cameo in the film as Superman's arch-nemesis Lex Luthor.
We were told after Paradise Lost bottomed out, that Bradley Cooper will appear as Lex Luthor in a cameo role in the Man of Steel.
Back in April of 2011, we were provided information that the first draft of the script held a prominent role for Luthor, one that even saw Lex forcing the Kryptonians through a Phantom Zone portal using Kryptonite in the final battle. At the end of the movie, Lex considers forcing Superman through as well, but relents.