Marvel has managed to maintain consistent hype for the movie with no footage released to the public, and even Marvel insiders like James Gunn have stated that released footage often doesn’t hold up under repeat viewings.
Holding off on releasing the trailer for Infinity War has worked for Marvel thus far, but we will have to wait and see how much longer the studio can pull that off.
Of course, that doesn’t change the fact that arguments have been made that a movie like The Avengers: Infinity War would not even need to show a trailer before it hits theaters to keep up the element of surprise.
As the culmination of a decade’s worth of Marvel Cinematic Universe storylines and characters, the film already has an insanely dense, built-in fanbase.