The other big Marvel production news is the confirmation that the Spider-Man: Homecoming sequel will wrap production in December.
With this news also comes the current scheduled wrap date for the untitled Spider-Man: Homecoming sequel that will release only a few months after Avengers 4.
Like most blockbuster movies, the untitled Avengers: Infinity War sequel will undergo a number of reshoots over the summer, which presumably will not be too expensive.
Because of this, there should be no need to worry if these reshoots are bad tidings for Avengers 4.