Tony Stark might put on the suit in Captan America 3.
Robert Downey Jr. is ready to join the cast of Captain America 3 movie as Tony Stark or Ironman. This is a very good news if it happens as Ironman popularity will help boost Captain America movies box office take. The best part about this is that Captain America is the leading role and no matter how popular Ironman, Captain America will be the one shining in his movie. This will not be like 2012 Avengers in which Ironman was clearly the lead role despite being a team up movie.
It is not yet know if Ironman will play a cameo or a big role in the movie. Captain America vs Ironman melee fighting session should be put on this movie as well specially if a possibility of a civil war movie is bound to happen in the future. Civil War is a marvel comic book arc in which both Captain America and Ironman are leader of their respective team and fighting each other.