Marvel Studios president Kevin Feige talked about which characters get a post-Avengers push:
“I think what Ed Brubaker and Matt Fraction have done with ‘Iron Fist’ lately is exciting. I think ‘Black Panther’ and Wakanda has some amazing potential to be a feature film. ‘Doctor Strange,’ as you’ve mentioned. There are some obscure titles, too, like ‘Guardians of the Galaxy.’ I think they’ve been revamped recently in a fun way in the book… I think S.H.I.E.L.D. could be it’s own franchise. I think, frankly, ‘The Avengers’ is going to be told from that point of view more so than any of the other films at that point, so we’re going to get an inside look [at how S.H.I.E.L.D.] operates.”
Source: Spinoff Online