The first two John Wick movies center on the title character played by Keanu Reeves, only giving indications of the larger world that the character occupies.
That being said, The Continental is not intended to center on John Wick himself.
Progress continues to be made on a John Wick prequel TV series, with a working title and general premise now in place.
A TV series has long been part of the larger scheme and now it looks like that series is coming together.