The word "Homecoming" appeared in the words used to control Bucky's mind before returning
to the Soviet Union, possibly alluding to Spider-Man: Homecoming, which will be released in 2017.
Vasily Karpov
in Bucky's 1991 flashback, we can see Bucky being brainwashed by an unknown Soviet agent. Later, when the new villain Zemo made his first appearance, he found a hidden box of Hydra materials, in which Bucky's past documents revealed that the Hydra agent's name was Vasily Karpov. .
In the comics, Karpov discovered the frozen Bucky and transformed him into the Winter Soldier. He also trained a team of Red Guardians for the Soviet Union.