The Hollywood Reporter confirmed that Cotillard is in talks to appear in the film in what sounds like a major role. The only factor is scheduling - she would start shooting in June and she’s going to be having a baby this spring.
What role would it be? The Hollywood Reporter agrees with my previous speculation, that Talia Al-Ghul will be in the film. I had told you that there was a character who tied the film’s disparate elements together, and Talia Al-Ghul, daughter of the first film’s R’as Al-Ghul, is a perfect choice. It puts a nice bow on the series and might actually allow Christopher Nolan to get some sex in his Batman films - both Talia and Seline Kyle, played by Anne Hathaway, have been Batman’s love interests in the comics. Talia actually bore him a son!