As an addendum to the Anthony Mackie/Falcon casting, Variety report that Sebastian Stan will indeed be back for the sequel to Captain America: The First Avenger - now titled "The Winter Soldier". This isn't exactly unexpected, especially when you factor in that Stan has signed a six-picture deal with Marvel, and the title refers to his character!
For those unfamiliar with the comic storyline, Stan will - unless there are some drastic alterations made - be playing the antagonist this time around, as he returns after apparently falling to his death as The Winter Soldier, a bionic armed, brainwashed assassin. But now that Cap has some help in the form of The Falcon, don't expect Bucky to be the only one giving the heroes headaches.
Joe and Anthony Russo will helm
Captain America: The Winter Soldier, which is set for release April 4, 2014