The “Booster Pack” DLC will release on February 21 for FFXV, and season pass owners.
Though not much has been said about the differences between the paid and free version, all we know for sure that the DLC will come with the invincible suit (Magiecteck Exosuit) which players can use for 30 minutes per day.
Square also announced Episode Gladiolus, the first of the three DLC episodes will be releasing on March 28. It will be from the perspective of Gladio the royal bodyguard, and friend of prince Noctis.
On the FFXV website it says:
The Gladiolus DLC will also bring back a familiar face, Glimesh, from some of the past Final Fantasy games.
The next, Episode Prompto, is coming out sometime In June 2017, not much else has been said about it. Nothing has been said yet for Episode Ignis or the multiplayer expansion, so stay tuned on GameSkinny for more information on that.