As anyone who’s been paying attention to the studio’s output over the last few years already knows, it’s clear that Marvel likes to give advance warning of what audiences should be concentrating on for future movies. The Avengers ended with a Thanos cameo that sent eager fans to The Infinity Gauntlet comic books, and just the title of Captain America: The Winter Soldier was a signpost directing them to track down the comic book collection of the same name.