This post contains spoilers for ANT-MAN.
You should know by now in the end credits scene of ANT-MAN the Winter Soldier is shown with his bionic arm in a vise and Cap and Falcon in the same room discussing their next move. This has been confirmed as a scene straight from CAPTAIN AMERICA: CIVIL WAR.
Actor Sebastian Stan, who plays Bucky Barnes / Winter Soldier, spoke with BuzzFeedGeeky about that scene at the end of ANT-MAN.
"I think [what Bucky was caught in was] more of a vise. But it would never happen at his own hand, by his own doing. In terms of that scene in Ant-Man, I've seen some of the ideas people have about it and I would say that whatever you're seeing on the surface, it's not as obvious as that. There might be a lot more to the scene. I would say someone would probably want to put him in a vise."
Who would want to put the Winter Soldier in a vise? Cap? Maybe if the Winter Soldier was still willing to fight his former friend due to continued memory loss. But this is doubtful because he saved Cap at the end of CAPTAIN AMERICA: THE WINTER SOLDIER. Although anything is possible without knowing the context previous of the scene.
The most logical explanation might be that Cap and Falcon arrived at a facility owned by Tony Stark or Hydra and they are trying to free Winter Soldier from whatever torture Stark or Hydra are inflicting onto the Winter Soldier.
Whatever the case, it seems like a previous report by The Daily SuperHero which had its insiders relay info saying the Winter Soldier is the most important person in Civil War could be on its way to being the next little scoop becoming truth. Read that older post link below.
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CAPTAIN AMERICA: CIVIL WAR Plot Hinted at as Well As Ant-Man's Involvement Teased