Board Thread:Questions and Answers/@comment-25221943-20170412192301/@comment-27020644-20170412220649

Avengers 4 is a sequel to Infinity War. It will not be a 2 part movie, Marvel announced that last year. Avengers: Infinity War was Avengers: Infinity War Part 1 and Avengers 4 was Avengers: Infinity War Part 2, but Marvel announced that Avengers 4 will not pick up where Infinity War left off so they changed the titles.

As for what it's about, it's rumored that Thanos will return, but that's all we know so far. We'll know more next year after Infinity War is released and they start making the movie.