WWE Superstar, John Cena In The Running For Superman?

Rumors have risen saying that Warner are eyeing up WWE Superstar, John Cena for the role of Superman in Zach Snyder's "The Man Of Steel". WOW! I like John Cena, but I really can't see him playing Clark Kent/Superman, he's too muscular.
It's also rumored that Dwayne "The Rock" Johnson is being considered for an unknown role in the film, probably playing a villain.
And on the note of "The Man Of Steel", Zach Snyder revealed in an interview with Empire Magazine that General Zod will not be the film's villain. I sooooo hope it's Brainiac, like originally planned.