Earlier this year, Arrested Development creator Mitch Hurwitz told DS that he and co-writer Jim Valley were beginning to work on the feature film adaptation.
Tambor, who portrayed both the manipulative George Bluth and his kindly twin brother Oscar on the cult hit, has now claimed that Hurwitz and Valley continue to work steadily on the project.
"Here's what I know and it's the truth, rather than any hype, and I'm pleased to say it," the actor said, according to BlackBook magazine. "The script is being written even as we speak, and it may even be completed."
He continued: "I think all systems are go, and I think it's very possible that you and I could be talking about the making of this film or even it being made by this time next year.
"It's all going forward and we have a better opening now, it's the perfect opening. I think it would be foolish not to take advantage. We have a better fanbase now than we did then."
Tambor further explained that one highlight of working on Arrested Development was getting to play two opposing characters like George and Oscar, which he revealed happened only by chance.
"Oh, I loved it," he said. "There's a story about that. I had a terrible wig for George when they did the younger George, so we were trying on wigs one day, and we had it real long, and all of a sudden, I think somehow I walked out of the make-up trailer and Mitch Hurwitz was there, and he said, 'Hold it, don't move'.
"He called the writers over, and right there the brother was born. Oscar wasn't even conceived until then. And that was the thing about Mitch and the series - it had a very serendipitous nature. It was tightly written, it wasn't all improv, but I mean the fact that a character could just be born, just like that."
His co-star Jason Bateman recently touted Hurwitz and Valley's screenplay as "incredible" and promised that the movie will be "everything [fans] would want it to be and more".
Watch a clip from Arrested Development where Oscar reveals a shocking secret to Buster Bluth below: