Not much on details, but evidently John isn't dead (yet)... More info on a animated prequel too.
variety.com

Keanu Reeves Set for ‘John Wick 5’ as Franchise Expands With Animated Prequel Film, Donnie Yen-Directed Caine Spinoff
Keanu Reeves is returning for "John Wick 5." Meanwhile, an animated prequel film and canine spinoff from director Donnie Yen are also in the works.
