Though the new female character is not yet confirmed, it is said to be a romantic interest to Chris Evans' Steve Rogers. Fans of the comics know that the odds point to the role being that of Sharon Carter. Originally the sister of Peggy Carter (played in Captain America: The First Avenger by Hayley Atwell), Sharon was later retconned to be Peggy's niece.
VanCamp will join Chris Evans, Sebastian Stan, Anthony Mackie, Frank Grillo, Samuel L. Jackson, Cobie Smulders, Scarlett Johansson and Toby Jones in the April 4, 2014 release. The sibling pair of Anthony and Joe Russo will direct.