According to Cinema Blend on March 30, Marvel Studios president Kevin Feige talks about how "Captain America 2" is setting the precedence for the Marvel Cinematic Universe. The film's third act seems to really leaves things open ended for the audience to speculate about events in "Avengers: Age of Ultron" and beyond.
Feige emphasized that while trying to maintain a balance with the film's main plot and the "connective tissue" of the Marvel Cinematic Universe, the Marvel Studios president does focus on their priority of the film's plot without veering off in a direction not consistent with the storyline.
The story being that Steve Rogers is being delved into a conflicting situation where he prefers to stick to his guns when it comes to his old-fashioned, apple pie ideals verses his experience in questioning authority.
Also, there's a question of distribution of how some films make a great impact versus a more subtle, personal impact as one film carries on to the next when it comes to the interweaving of the storylines. As an example how "The Avengers" had a psychological impact on Tony Stark in "Iron Man 3", which was an example that's more personal in nature as opposed to the end tease of "The Avengers" where Thanos makes his debut into the Marvel Cinematic Universe which leads the audience/fans to think that Marvel Studios is taking this to the stars and so on.