Re: MCU: The Marvel Cinematic Universe Official Discussion
I'm guessing for every non-Avengers year, they'll be wanting to have 2 heroes representing in summer. 2013 will probably be Iron Man 3 and Cap 2 (if the first one meets/exceeds expectations), and 2014 will be Thor 2 (again, assuming the 1st one does well enough) and [New Solo Hero: Ant-Man? Hawkeye?], followed by The Avengers 2 in 2015, and so on.
Note - I'm only predicting the Cap sequel coming before Thor's just because it was announced first. They could very likely be switched.
EDIT: I didn't know Marvel Studios was doing the Runaways. So maybe the Cap or Thor sequels will come later.