Just because it hasn't been announced yet, doesn't mean work has begun on a highly-anticipated sequel. According to the L.A. Times, director Jon Favreau has already started to develop Iron Man 2.

"We're working on it now," Favreau said, "which hasn't been officially announced. It will be released in 2010."

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Since Iron Man was one of the biggest hits of the summer, this seems inevitable and a formal announcement should be made soon. They are currently aiming at an April 30, 2010 release date.

We'll keep you posted on any and all updates surrounding this upcoming film.