Originally announced as Infinity War – Part I and Infinity War – Part II, it was later revealed that a new Avengers 4 title would be revealed at a later date.
While unconfirmed at this time, it certainly sounds like Avengers: Infinity Gauntlet is the Avengers 4 title.
Directors Anthony and Joe Russo, who return after Captain America: The Winter Soldier and Captain America: Civil War, are directing both Avengers: Infinity War and the fourth film.
The film is set to hit the big screen May 4, 2018 with its still officially untitled followup then arriving one year later on May 3, 2019.