Jon Favreau continues to update us with news about the rehearsals for Iron Man 2 via his account on Twitter. While the reports aren't very in-depth (and how could they be with a 140-character limit?), they're still nice glimpses into the production.

Here's what Favreau had to say on March 24th about working with three of the principals from the film:

@jon_favreau Great rehearsal today with Gwyneth, RDJ and Don Cheadle.

Then on March 26, Favreau wrote:

@jon_favreau Rehearsed today with Mr. Rockwell.

Favreau also offered up a picture of Rockwell. CLICK HERE to check it out.

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Iron Man 2, directed by Jon Favreau, will continue the tale of Tony Stark and his armored alter-ego as he continues his transformation from billionaire industrialist to super-hero. Robert Downey, Jr. will star as Tony Stark, with Paltrow returning in the role of his assistant Pepper Potts. Don Cheadle, Mickey Rourke, Sam Rockwell, Scarlett Johansson and Samuel L. Jackson also star. Iron Man 2 blasts into theatres May 7, 2010.