It is still unclear if she will play a love interest or another villain - Anne Hathaway has already been cast to play Selina Kyle (aka Catwoman) in the latest installment.
Cotillard is also pregnant (due in April), so she is expected to start filming in June, after the birth of her baby, according to the mag.
Filming on the movie is set to wrap in November.
The actress reunites with Inception director Christopher Nolan for this latest film and also joins her Inception co-stars Joseph Gordon-Levitt and Tom Hardy.
Christian Bale, Michael Caine, Morgan Freeman, Gary Oldman, and Anne Hathaway are all confirmed for the film.
It is set to hit theaters in July 2012.