Though he signed a two-picture deal to appear in "Avengers: Age of Ultron" and an upcoming third "Avengers," actor Robert Downey Jr. has previously indicated a reluctance to return for a fourth "Iron Man" outing. Maybe talks are progressing because in a recent interview with EW on the set of 'Ultron', Downey is now optimistic that it could happen so long as a deal can be made.
In a textbook example of what they call "negotiating through the press," the actor says: "It's down to Kevin Feige and Ike Perlmutter and Disney to come to us with what the proposal is, and that's on us to agree or disagree. When things are going great, there's a lot of agreement."
The magazine points out each Marvel sequel has outgrossed its predecessor and Downey knows it: "Right now, this has just been swell, hasn’t it? This ['Ultron'] has been a really good one and it feels good and we’re having a good time.”
Downey seems happy to retain the mask for now, "It's that thing of: why give up the belt when it feels like you can barely get jabbed?" but warns "most people are saying that right when they get knocked out" indicating that he could walk if Disney & Marvel don't comply.