Endgame’s trailers have been purposefully vague and skimpy with footage, so audiences should be able to go into theaters fresh, and see if any fan theories come to fruition.
As far as fan theories go, there have been a ton regarding the mysterious contents of Avengers: Endgame.
Marvel Studios has been keeping its cards close to the chest for the past year, allowing room for Ant-Man and The Wasp and Captain Marvel to have their time to shine in theaters.