From The Hollywood Reporter :

 "Arrested Development" creator Mitchell Hurwitz and his co-executive producer James Vallely are working on a screenplay for the long-debated feature version of their short-lived Fox series. Even as they prep a new Fox comedy series with "Arrested" star Will Arnett, the writers are spinning more bizarre encounters for the eccentric, spoiled Bluth clan for possible feature production in the spring.

...

Hurwitz and Vallely are now forging ahead. Scheduling might be difficult, however, as several -- Bateman, Cera and Arnett -- have seen their careers bloom in TV and film since the series debuted in 2003.

Director Ron Howard, who executive produced the series and provided the voice of the narrator, played himself in the final episode hearing a pitch of the Bluth story and suggesting it for a movie. Hurwitz, however, will direct the feature. ...

Full story