It appears that Square Enix has resorted to different means to keep the intrigue for "Final Fantasy XV" pretty high. The release of "Kingsglaive" apparently made fans hunger for more from the game instead of temporarily satisfying their craving with its several plot openings.
The BitBag reports that Ardyn Izunia, the Changellor of Nifleheim is more twisted and evil than he appears when he stated the killing Noctis will satisfy him. This gives viewers the impression that he has the intention of claiming the power of the crystal all for himself and eventually reign as the true king. On the other hand, it appears that Noctis does not even have an idea of what happened back in his hometown since he left.
Noctis was devastated when he found out that the barrier that had been protecting their empire had crumbled and when the citadel was destroyed, his father died. While he had no idea about anything happening back in home all along, this devastation could mean that he could seek revenge. Kotaku says that "Kingsglaive" is a mess as a standalone movie since most plot threads remain unresolved, being more similar to a TV season premiere than a movie. However, it was meant to accompany the game and somehow serve as an introduction; it sets the stage for the beginning of Noctis' trip and introduces some significant characters.
For those who are already sure that they will be playing "Final Fantasy XV" when it comes out, then this movie is a logical must-see. "Kingsglaive" is an animated film that goes for around one hour and 45 minutes and is a direct prequel for Square Enix's upcoming masterpiece, Final Fantasy XV. It introduces the setting of the game and introduces a lot of conflicts on which the game will be presumably built around. The thing about it is, it is not a complete story in itself as it is a prologue to a story which will take hours, or maybe weeks to finish.
Aside from a movie, Square Enix has announced that it will be releasing a spinoff of "Final Fantasy XV" for mobile. The game will be called "King's Knight: Wrath of the Dark Dragon" and just like "Kingsglaive," presumably shows the story from a different angle.