Marvel has made an art form of the post credit tease. There have been 18 so far in MCU films. According to Marvel bigwig Kevin Feige, Avengers: Infinity War will pay them all off.
In a special feature on the Thor: Ragnarok DVD and Blu-ray, “Marvel Studios: The First Ten Years – The Evolution of Heroes,” Infinity War co-director Joe Russo says, “Every story that Marvel has told since Iron Man 1 finds a narrative thread in these next two Avengers movies. It is a culmination of all that storytelling.” Marvel is saying very little about the film, but that’s a huge undertaking, to connect everything from Tony Stark listening to AC/DC to T’Challa’s confrontation with Killmonger. If you skipped Thor: The Dark World, “because it looked boring,” or Ant-Man, “because I burned out on Marvel after Avengers: Age of Ultron,” you have until May 4 to catch up.
“With Infinity War, we are paying off every little thread, every little tease, that we’ve had in what will be 18 films prior to Infinity War,” Marvel Studios head Kevin Feige said. “There’s never been anything like this. Being able to, film after film, tease at a larger story. Really building these stories up until a conclusion, while at the same time, introducing an entirely new direction for the future.”