In the sequel to 2011's Captain America: The First Avenger, we follow the Captain as he struggles to adapt to the current world and fights his moral center in regards to the moral "grey area" S.H.I.E.L.D. operates in. It also serves as a re-introduction to his wartime friend Bucky Barnes, aka. The Winter Soldier. Bucky has been engineered into a super assassin.
I think this is a great first trailer and it seems to promise a decent amount of action and conflict. It doesn't give any background to The Winter Soldier, but I'm sure this isn't going to be the only trailer we will have. I also like the new Captain America suit.
Captain America: The Winter Soldier opens up on April 4, 2014. It stars Chris Evans, Scarlett Johansson, Samuel L. Jackson, Robert Redford, Sebastian Stan, and Anthony Mackie.