There are several articles out that are speculation on where John Wick 4 will go in the next chapter.
Bleeding Cool’s article is based on comments that Jason Mantzoukas made during his recent appearance on Conan. It is not clear if the remarks were made tongue in cheek or he was speculating on possibilities based on where JW3 left off.
Business Times also has a post up on possibilities where JW4 will go based on the standing of characters at the end of JW3.