Military.com had a chat with Terrence Howard's who plays Col. James 'Rhodey' Rhodes in Iron Man, the actor confirmed that he will begin filming for Iron Man 2 in March of 2009. The sequel has already been scheduled for a release on April 30, 2010. Jon Favreau is expected to direct again, with Robert Downey Jr. and Gwyneth Paltrow returning as well.
Jon Favreau wrote on his MySpace page saying the scheduled release date for Iron Man 2 as "unrealistic", and there is no start date for filming as there no writers attached at this time.
Neither Robert [Downey Jr.] nor I were consulted about this and we are both concerned about how realistic the date is in light of the fact that we have no script, story or writers hired yet.