"Gravity, the 3D film that Warner Bros is mobilizing with director Alfonso Cuaron and Robert Downey Jr., is suddenly in danger of falling back to earth after Angellina Jolie said no to a full court press and a big money offer to star in the film. It has put Warner Bros in a bind. The studio needs an actress who can hold the screen and draw an audience to an $80 million film. Much like Tom Hanks' role in Cast Away, the Gravity heroine is the only person onscreen for a large part of the movie."
Hmm it was mentioned in July already. Not sure if this is actual news this month...