It had been previously announced in an interview with the Russo Brothers that the upcoming Avengers: Infinity War Parts 1 and 2 would be receiving a title change to reflect how starkly different the two films are, but Comic-Con passed with no new title announcements. But now the next Avengers movie has a new title, and it’s pretty damn similar.
Disney has announced the third film will simply be called Avengers: Infinity War, a slight change from its previous title as it drops the ‘Part 1’. The former ‘Part 2’ however is still in search of a new title and is currently being referred to as Untitled Avengers Movie.
The title Infinity War stems from the 1992 comic series of the same name wherein the Marvel universe banded together to fight evil versions of themselves created by Magus as he tried to get control of the Infinity Gauntlet. The Gauntlet has been seen in the Marvel Cinematic Universe several times with an easter egg appearance in Thor, and a post-credit scene appearance during Age of Ultron where Thanos puts the glove on.
It is unclear as to whether Magus will be appearing in either of the upcoming Avengers films as a secondary antagonist to Thanos, but Thanos is clearly the primary antagonist which will roundout the first three phases of the MCU.
Avengers: Infinity War and its sequel are still scheduled for their previous dates of May 4, 2018 and May 3, 2019 respectively.