Whilst the secretive trailer-style presentation has not been shared publicly, ComicBook.com has detailed the contents of the footage. The clip begins with Bucky (Sebastian Stan) visiting Baron Zemo (Daniel Brül) – who you might remember from Captain American: Civil War – in a high security prison.
Zemo attempts to activate Bucky’s Winter Soldier programming, which is now defunct, and the hero instead tells Zemo that someone has attempted to restart the program. Cut to a heavily patriotic rally (“red, white, and blue decorations, cheerleaders, the works”) and an announcer introducing a new Captain America. We see a silhouette figure with the shield – though it’s neither of the eponymous superheroes and probably US Agent, played by Wyatt Russell and seen briefly in the previously released Disney Plus trailer.