While he hasn't officially signed onto anything, it's rumored to be a conflict with a Sherlock Holmes sequel. Or maybe he just needs a break -- I mean, two franchises plus The Avenger and its spin-offs? Maybe he drew the line at a third. Too bad. He looks so good in hats!
Cowboys & Aliens still boasts one half of the Iron Man duo, as Jon Favreau remains in the director's chair. The hunt is currently on the hunt for a manly actor who can replace Downey Jr. The film is a potential franchise for any one brave enough to grab the reins and play Zeke Jackson, leader of the anti-alien revolt. All those who failed to get in The Green Lantern or Thor might want to call up Favreau and DreamWorks, because once you're in a Favreau comic adaptation, you're untouchably awesome.
Production is tentatively set to begin this year for a release in summer 2011. In the meantime, you can still read Cowboys & Aliens online and cast your vote for Zeke Jackson in the comments. DreamWorks could use the help.