Rudd will play an ordinary man (as always) who lives in a world where free will doesn't exist. The lives and destinies of every human being are scripted by scribes in Heaven. One day, Rudd's writer (Galifianakis) quits, leaving Rudd to go about his day unscripted. A magical journey of destiny and hidden potential unfolds. (Really, that's how THR describes it. No "and then his pants fall off" kind of thing.) It was scripted by Demetri Martin, so it may verge on quirky.
It's hard to praise the pairing of Galifianakis and Rudd without having seen Schmucks, but Rudd seems to play well off everyone and Galifinakis' sardonic style is begging for more movies. This could be a lot of fun, or it could be cloying and cute. Let's hope it's got some bite.