SPOILERS FOLLOW.
Captain America: Civil War features not one, but two post-credit scenes. The mid-credit scene features Bucky voluntarily going back under the cryogenic freeze because of the events that happened in the movie and the fact he’s still capable of being brainwashed.
The scene features Bucky, Cap and Black Panther, as Bucky is frozen at a location in Wakanda. Cap tells Black Panther if they know Winter Soldier is in Wakanda, they will come for him. Black Panther says let them, as the camera pans revealing Wakanda and a Black Panther statue.
Here is what Kevin Feige offered to Cinema Blend about the Captain America: Civil War mid-credit scene:
That was always sort of the idea for the end of the movie, and as the movie was being developed, it felt like it would be additionally cool to have that happen in Wakanda – a super advanced place. They’ve got something that he could go in. And also, it speaks to Panther’s arc. The person that he was out to kill early in the movie, he’s now nobly helping. And then, of course, that led organically to a cool moment, where Cap can go, ‘Thanks for doing this, but they’re going to come get you.’
“Captain America: Civil War” is now in theaters directed by Anthony and Joe Russo starring Chris Evans, Robert Downey Jr., Scarlett Johansson, Jeremy Renner, Elizabeth Olsen, Sebastian Stan, Anthony Mackie, Frank Grillo, Paul Bettany, Don Cheadle, Emily VanCamp, William Hurt, Martin Freeman and Chadwick Boseman as Black Panther.
Synopsis:
Captain America: Civil War picks up where Avengers: Age of Ultron left off, as Steve Rogers leads the new team of Avengers in their continued efforts to safeguard humanity. After another international incident involving the Avengers results in collateral damage, political pressure mounts to install a system of accountability and a governing body to determine when to enlist the services of the team. The new status quo fractures the Avengers while they try to protect the world from a new and nefarious villain.