While we didn't think Josh Duhamel wouldn't be in Transformers 3, the star recently confirmed his involvement and gave some other details as well. CinemaBlend caught up with the actor at ShoWest today, who said that the Transformers 3 script was complete and that the film would shoot this summer. Here's an excerpt from the site's article.

What's more Duhamel says he met with Michael Bay yesterday and the Transformers 3 script is now complete. They're preparing to start filming it this summer.
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Michael Bay will be directing the film from a script by Ehren Kruger, who co-wrote Transformers: Revenge of the Fallen. Paramount has already set a July 1, 2011 release date for the film. We'll be sure to keep you posted on any and all Transformers 3 developments as soon as we have more information.