In the past, Emily Blunt was Marvel's first choice to play Black Widow in Iron Man 2 but she passed on it and it eventually went to Scarlet Johansson ("The Avengers"). She was also offered the role of Peggy Carter in Captain America: The First Avenger, but she passed on that as well. That role eventually went to Hayley Atwell. Because of those choices Scarlet has become one of the highest paid actresses in Hollywood and Hayley has managed to get a spin-off television series based, Agent Carter. Suffice it to say, Scarlet and Hayley owe Emily a thank you for her pickiness. It was assumed that Blunt would never land a Marvel or DC Comics-like comic book role, but a new rumor claims she is up for an undisclosed role in Batman v Superman: Dawn of Justice.
"The actress Emily Blunt will land on billboards worldwide with her film 'Edge of Tomorrow', in what appears to be a great science fiction role. Now her name returns to the orbit of comic adaptations with her possible incorporation in 'Batman Vs Superman', directed by Zack Snyder. A film that has been shooting since last month." - El Multicine
Translated by soforizo
Let me stress, I don't know how reliable or not this website is, so take this rumor with a grain of salt.
Currently, Emily Blunt ("The Devil Wears Prada") is doing press for the new comic book movie, Edge of Tomorrow. She's been earning rave reviews for her performance as a kick-ass soldier who trains Tom Cruise's character on how to harness his new alien-abilities in order to save humanity.
Read more at http://www.comicbookmovie.com/fansites/nailbiter111/news/?a=101160#YIrUfBf21pRJ3Cev.99