Ardyn's DLC will still be arriving in March 2019, and it sounds like that could be last DLC we see for Final Fantasy 15. Not only that, but three of four DLC episodes have been canceled; namely, episodes Lunafreya, Noctis, and Aranea.
The reason behind the move seems most likely to be related to Square Enix's poor earnings report, which saw it publishing a loss of a massive $33 million.
Ofuji said that "the desire is to deliver this new AAA experience to everyone even a day sooner", so they're cutting their FFXV DLC plans short.
"It's nearly going to be two whole years since the release of Final Fantasy XV". The game's director Hajime Tabata has resigned at the same time as this announcement, both from Square Enix and Luminous Collective. "The desire is to deliver this new AAA experience to everyone even a day [sic] sooner, and due to this directional change, the company chose to focus our resources on the development of this AAA title".
"In regards to my next endeavors and near future, I have a project that I truly wish to solidify as my next challenge after Final Fantasy XV".
The first of Final Fantasy XV's four planned DLCs will still see release in early 2019. "For that reason, I have made a decision to leave my current position and start my own business in order to achieve my goal".
Square Enix will also release a new quest for Final Fantasy XV on December 13 (December 12 in North America) as part of a collaboration with Final Fantasy XIV. The new standalone version will include new bosses and other extras, like costumes and weapons, upon its release next month.
Final Fantasy XV is available on PlayStation 4, Xbox One, and PC.