Final Fantasy XV has carried a weird life since its release nearly a year ago. With single-player DLC keeping it alive (and patches to its campaign improving its story), Final Fantasy XV has become effectively a "service," as so many other games are aspiring to be—for better or worse.
We've known the latest addition, a multiplayer mode, has been on the way for awhile. In August, it hit beta for a brief time. It was supposed to release on Halloween before getting delayed. But at last, Final Fantasy XV's "Comrades" multiplayer expansion will be released far and wide.
Final Fantasy XV: Comrades will hit the game officially on November 15th. The multiplayer expansion requires a subscription to PlayStation Plus or Xbox Live Gold to access, given its online necessity. It's not a free expansion though: it comes included either as a standalone purchase or within Final Fantasy XV's own season pass.
Square Enix's webpage for the expansion clarifies that the new multiplayer section isn't tacked in with the rest of the game. In it, players create their own member of the Kingsglaive, like Noctis and co. from the single-player game. Together with three other players, they all "join forces to bring the Light back to the kingdom of Lucis." In the future, "other members" of Noctis' core party will be made playable in updates to Comrades, including Gladiolus, Prompto, and Ignis.
While Comrades is billed as the "first and only" multiplayer content for Final Fantasy XV, it's not the end of post-game DLC in general. On December 13th, the third episodic DLC Episode Ignis releases. Episode Ignis follows a small story from Ignis' perspective, as Episode Prompto and Episode Gladiolus did for their respective party members. At Sony's Paris Games Week showcase, we got another peek at the dramatic turn for Final Fantasy XV's familiar diner-menu-thief Ignis. Beyond Episode Ignis, Square Enix has noted they will continue support for the multiplayer Comrades expansion.