The actress started filming Knight in June 2011, working on and off until the fall in locations including Los Angeles, New York and Pittsburgh. She says there were long gaps when she wasn't needed: "It was a very, very small role."
Otherwise, Cotillard is coy about the picture, whose storyline has fueled pages of Internet speculation. All she'll confirm is that, contrary to some fans' belief, she does not play Talia, the vengeful daughter of Liam Neeson's character, Ra's Al Ghul (who also appeared in Batman Begins), and that she takes the role of Miranda Tate, an ecologically minded businesswoman who "is fascinated by Wayne Enterprises. They go through difficulties, and she wants to help provide the world clean energies. She's a good guy." But does she stay that way? "Yes," she insists.
You can check out the full interview at the link above. The Dark Knight Rises opens in theaters and IMAX on July 20.