After the announcement that James Gunn would be directing the upcoming Marvel adaptation of Guardians of the Galaxy, the news-front for the film was on the quiet. According to ComicBook.com, Marvel is keen on bringing Robert Downey Jr. into the film in his Tony Stark/Iron Man role. Interestingly, Downey’s contract is done with Marvel Studios after Iron Man 3, meaning he would have to sign a new contract. With the success of the Iron Man franchise and The Avengers, it seems likely Downey Jr. will be on board to sign a contract, but that doesn’t guarantee him a role in Guardians of the Galaxy.
In the soon to be “Guardians of the Galaxy” series from Brian Bendis and Steve McNiven, Iron Man is said to be a part of the team, so it would only make sense for the film to coincide with the latest series. That said, this is still only a rumor as there’s been no name attached to the source of such news.