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FFXV will receive one more DLC next year in Episode Ardyn, the rest have been cancelled due to a combination of circumstances such as Tababta's departure from SE and the XV Team has been changed into the Luminous Productions studio who are currently working on next gen titles for SE. The team has hopes to release the three DLC that were cancelled in some capacity, but no further details have been given, though Ardyn's VA in this video may have spilled the beans on what SE plans to do...
Source: Siliconera