According to Mstars News on April 1, Marvel Studios president Kevin Feige spent some time explaining how "Captain America: The Winter Soldier" ties into "Avengers: Age of Ultron". He talks about how Steve Rogers is attempting to make a decision in his life that some may consider a defining moment.
"I don't want to give too much away but it is very much a continuation of this story line and sort of going back into The Avengers fold. Steve is now torn between is he just a soldier? You know there is a scene in Winter Soldier where Anthony Mackie asks, Well what would you want to do if you are not a soldier anymore?' and part of his journey in The Avengers is to answer that question".
Feige also explained that he does want to do a solo "Hulk" film with Mark Ruffalo, however this is a desire that doesn't fall within the wheel house of phase two. On the other hand, the Marvel Studios president gives fans some assurance that Hulk and Hawkeye will make up for their lack of presence in solo films and trade up with larger roles in "Avengers: Age of Ultron".
Feige also mentioned that great collaborative efforts of those who have all worked on the Marvel Cinematic Universe array of films. When he was asked about who had the greatest impact on the superhero movie, Feige had this to say:
"Both. It really is both. The only way we can work is with a very, very intense collaboration. And I think Joss was aware of that when he signed up for us the first time. It's still the case this time. But to his credit, he hasn't said, I directed the third highest grossing movie of all time, I don't need anybody. He is very, very collaborative and he is also very, very, very good. Just like the Russo's and like James Gunn right now on Guardians of the Galaxy. We are very lucky to work with people that are so collaborative with us and can elevate our initial idea. Even to elevate something in the way that we weren't expecting. That's their job and the best of them are able to do that very, very well. There are things that Joss is doing in Age of Ultron that will be amongst the best elements that we've ever brought to the screen".
Joss Whedon's "Avengers: Age of Ultron" appears in theaters come May 1, 2015.