Arrested Development creator Mitch Hurwitz confirmed that he is currently writing an Arrested Development movie script. He also said he hopes to shoot and release the film before the end of the year. That said IMDB lists the film’s release as 2012. At least they list it. Hurwitz told Digital Spy similar news.
The conversation seemed to confirm that everyone from the series cast would be in the film. And he revealed that the rumor that Michael Cera didn’t want to do the film (because he’s become such big a movie star) was propagated by the cast (including Cera), until he started to get hate mail from fans.