Kevin Feige recently revealed that the marketing material for the upcoming movie will reportedly come from its first 15 minutes, meaning that Marvel Studios will be keeping the vast majority of the film a total mystery.
There’s also the possibility that the first trailer for Avengers: Endgame is purposefully trying to throw the fans off the trail of the true story.
While this provides its own challenges regarding trailers and TV spots, the anticipation for Endgame is likely enough to fill seats and make box office gold.