Now that has changed, and it has been confirmed that Avengers: Infinity War and Avengers 4 are shooting separately.
Avengers: Infinity War will assemble the largest cast ever for a Marvel movie.
There is no word on exactly when Avengers: Infinity War will wrap, but the movie has been shooting since February.
That changed last year when it was announced that Avengers 4 is going to get a different title and is not just the second part of Avengers: Infinity War.