The Russo Brothers want to give us something different for the 3rd Cap film.
IGN gives an overview of the Russo thought process going into the first two films. The Brothers also mention that Hawkeye is looking to have a bigger role in the next film.
I was quite surprised at the great writing and directing of Captain America: The Winter Soldier. Since they are looking to outdo themselves, let’s see what they think up next, when the film gets released in 2016.