VIDEO : What Do We Know About 'Avengers 4'?

The plot of Avengers 4 is being kept top secret.
The as-yet untitled film will usher in the next phase of Marvel Cinematic Universe.
ComicBook.com said the film will be released May 4th.
There is still a lot fans don't know, such as the fate of the heroes who died during 'Infinity War,'
There is speculation that Brie Larson's Captain Marvel is the key to saving the world in Avengers 4.
Larson will debut as Captain Marvel in March 2019.