According to Redditor abigfriend, the title for Avengers 4 will be revealed directly after the final post-credits scene of Ant-Man and the Wasp as an after-credits tease.
The leaked details went more in depth about how strongly the events of Ant-Man and the Wasp will affect Avengers 4.
This is following the previous precedence of the first Ant-Man film where another Avenger shows up as a cameo in an Ant-Man movie.”
According to a new “leak” on Reddit about Avengers 4, the secretive title of the movie will be revealed after the credits of next month’s Ant-Man and the Wasp.