According to The Daily Mail, Gary Oldman is in negotiations to play George Smiley, the anti-James Bond, in a big screen version of John le Carre’s 1974 novel Tinker, Tailor, Soldier, Spy. Read the full article here. Colin Firth and David Thewlis are also being considered for supporting roles.
I've never read any of le Carre's works, so I did some quick and dirty research (Thanks, Wikipedia!) and it sounds like this will be an interesting movie no matter who they end up casting as Smiley. Alec Guinness played Smiley in the 1979 BBC television version of the film.
For those interested, here are Wikipedia entries for the novel Tinker, Tailor, Soldier, Spy and the character George Smiley.
Sheesh, I kind of went hyperlink crazy in this post, didn't I?