This short sixteen minute anime film will serve as a prologue for next month's final DLC release, Episode Ardyn. The video is subtitled but free to watch on Youtube much like the Brotherhood Episodes from a few years back. The actual final DLC will launch next month on March 26th.

In addition to this, FFXV is to receive a light novel adaption called "Final Fantasy XV: Dawn of the Future". Japanese fans can pre-order the novel as a special editon set which also comes with a Blu-Ray copy of Episode Ardyn Prologue and a few other merchandise goodies.

Source: Siliconera