The initial beta was plagued by server issues, and the second beta was meant to fix matchmaking issues that were present in the first round of the beta. Players could make an avatar and get some quests, but couldn’t get into a lobby to experience the content.
While the tweet claims the delay is for some final adjustments, we can only hope that the extra polishing time will work out all the kinks when it does finally launch. Final Fantasy XV: Comrades is not a free update. It will be available as part of the title’s $25 season pass or for purchase individually.