https://www.gamespot.com/articles/final-fantasy-15-comrades-multiplayer-release-date/1100-6454703/

Final Fantasy XV's online multiplayer expansion, Comrades, is nearly here. Following a delay that resulted in it missing its October launch, Square Enix has provided a new release date for the multiplayer DLC, and it's out in just over a week on PS4 and Xbox One. Comrades launches on November 15, Square Enix has announced.

That's about two weeks than previously planned, as Square Enix originally had scheduled it to come out on October 31. However, Comrades was delayed for some exceedingly vague reasons--the developer said it was "due to final adjustments and to create the best possible experience." It's offered no further insight into what issues it may have needed to iron out.