Then we were talking to Will Arnett. And this is what he said: "Yes, it's happening." He went on, but here's the upshot: there is a script—!!!—but it is not finished; all of the principle cast members are on board, but there is no timetable to actually make the movie. So then we called Mitch Hurwitz to make sure that our ears did not deceive us and that Arnett wasn't just pulling our leg. They didn't, and he wasn't.
"Believe it or not, we have started the script," Hurwitz told GQ. (And by "we," he means himself and "Arrested" co-executive producer Jim Vallely.) "We're taking a little abeyance while we get ['Running Wilde'] up and running. But it is our absolute next priority and we can't wait to do it."
So, rejoice! Hurwitz also had a bit more to say: "We're changing some of the Bush references to Obama because we started it awhile ago. And the Bluths may not be vacationing in the Gulf of Mexico anymore. We also might have to recast the part of Uncle Mel, the former action movie star. But other than that we have a clear path."
Of course, the question remains when the movie will actually happen. And that's still the hard part, seeing as it will require the coordination of about a dozen very busy schedules. "As Mitch likes to say," Arnett told us, "we're just going to wait until there's zero interest, and that's when we'll do it."
http://www.gq.com/blogs/the-q/2010/07/gq-exclusive-arnett-hurwitz-confirm-arrested-development-movie-is-on-like-donkey-kong.html