That being said, Robert Downey Jr. accidentally dropped a bombshell in interview promoting Due Date that Zach Galifianakis will be featured in the upcoming, untitled, Jason Segal written Muppet movie. Taking part in another kids film (I'm not going to sugarcoat it, that's what it is, but I'm still definitely gonna see it) after G-Force seems like an odd move by Galifianakis, but news about the star get even weirder.
On the one hand, this seems kind of understandable because Gibson carries a lot of stigmas and just being around someone who, for example, hates the Jewish community would be very morally conflicting. On the other hand... you're a comedian with one big movie hit to your name, should you be making these kinds of calls? Yes, Galifianakis is one of the sole reasons that The Hangover was memorable other than an awesome plot and great action/pacing/etc., but still, the theory stands.