Jason Bateman (he of Arrested Development, Juno, and Teen Wolf, Too fame) gave Bluth fans more hope recently by telling MTV Movies that "The Arrested Development movie is not dead, au contraire."
For this rabid fan, it's actually one of the few shows that I think could work and be benefitted by a big screen adaptation. SpoutBlog has put together a nice list of possible "AD: The Movie" scenarios. Any ideas to add? A Franklin spinoff, perhaps?