"Captain America: The First Avenger" was one of the most satisfying films in Phase One of the Marvel Cinematic Universe, and the initial trailer for the sequel promises a darker, more contemporary tale combining explosive superhero action with the type of trust-no-one suspense found in the best paranoid thrillers.

We've broken down some of the most intriguing aspects of the new "Captain America: The Winter Soldier" trailer (which you can watch at the top of this article) including a few observations and questions about Anthony Mackie's high-flying debut as Falcon, the moral ambiguity of Robert Redford's character and S.H.I.E.L.D., Chris Evans' new duds and Scarlett Johansson's new 'dos. 

Check out the 10 things we learned from the "Captain America: The Winter Soldier" trailer here: