The untitled Avengers film, colloquially referred to as Avengers 4, is an upcoming American superhero film based on the Marvel Comics superhero team the Avengers, produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures. It is intended to be the direct sequel to 2018's Avengers: Infinity War, as well as the sequel to 2012's Marvel's The Avengers and 2015's Avengers: Age of Ultron and the twenty-second film in the Marvel Cinematic Universe (MCU). The film is directed by Anthony and Joe Russo, with a screenplay by the writing team of Christopher Markus and Stephen McFeely, and features an ensemble cast with many actors from previous MCU films.

What's the best answer to this question: is avengers 4 part 2 of infinity war?
yes