Anthony Russo, while speaking on set to Sina Weibo (h/t ScreenRant), gave a not-so-subtle answer to the question of Bucky’s new arm. For everyone who’s seen Captain America: Civil War, they know Bucky was taken in by T’Challa in Wakanda.
As we all also know, that arm was literally ripped off by Tony Stark’s Iron Man suit during that epic three-way battle in Captain America: Civil War.
Bucky Barnes, a.k.a. the Winter Soldier, is back for Avengers: Infinity War, and in the first trailer it sure looks like his arm is back too.