I haven't heard anything about a movie of The Other Boleyn Girl, either. Please keep us posted.
As for Keira Knightley, I just read in the paper that she will star as Elizabeth Bennet in a new British film of Jane Austen's Pride and Prejudice, to be released in mid September. Knightley is not my favorite actress - she's beautiful but IMO rather affected and mannered in her acting - and I'm having even more trouble imagining her as Elizabeth B. than Anne B.! At least the real Anne had a certain dramatic sweep and theatricality to her personality, and in TOBG she's supposed to be "acting" the role of an innocent young girl all the time (because she's really an evil scheming witch!). Knightley might be able to pull that off. But Elizabeth Bennett is supposed to be frank, natural, and down to earth. Can Keira handle it? Maybe with the right director?