Michael Fassbender confirmed as Heathcliff.

I, personally, think Sienna is a better choice than Portman. Her looks will have to be altered, but that's easily remedied. Sienna is actually a good actress, unfortunately, her personal life often overshines this fact. Plus i think she has a rawness about her that suits Cathy that Portam didn't posses.

However, Nat did look more like the Cathy i imagined than Sienna does. But i really would have wanted Rose Byrne, Emily Blunt or Hayley Atwell. But she's in very informal talks so who knows what'll happen. Sienna's supposed to be great in The Edge of Love though.

I always thought that Cathy should have a little bit inocent look. She was kind of lolita, selfish, manipulative but childish. Natalie had this inocent look but not that intensity( but I think under good direction she could be good Cathy).Sienna looks more calculative, matured.I have never seen her to play, so I can't judge her acting skills. But after all, I would rather see Natalie or Kiera as Cathy than her.I don't know.

I agree shes a better actress then Natlie Portman

But there 5 or 6 names I hoped John Maybury would consider before talking to some one famed for being in the spot light. To me sienna Miller is like every rich man daughter I would much rather see her play Isabella spolt, rich and blond. I dont think she has that mytruum that in my mind cathy has, hopfully he considering her for the role of Cathy Junior I role which I can see her playing much better.

Abbie Cornish is Cathy.