We finally know what Robert Downey Jr. was talking about when he said that there he was working on a deal with Marvel to do something that wasn't Iron Man 4. Downey's in the final stages of negotiations that'll bring Tony Stark in to Captain America 3 and begin the movies' take on Civil War.
|Our heroes: a steroid abuser and a war profiteer|
Wow... that's big
For those who don't know, Civil War is widely regarded as Marvels greatest comic crossover story, featuring an idealogical (and physical, because Superheroes) conflict between Iron Man and Captain America over a government act that will force Superheroes to register as government employees. Cap is anti-reg, leading a group of heroes as a resistance movement against Stark's gov funded pro-reg faction. Having Tony Stark as a well intentioned antagonist will likely split the fanbase, but from a storytelling perspective it's a great escalation of the Marvel Universe's themes of sacrificing freedom for security and points to the second Avengers movie showing a much darker side of Tony Stark.
Whose side are you on?