Square Enix revealed the FINAL FANTASY XV: Assassin’s Festival trailer. This odd thing is a cross over with Assassins creed. I know random, but hey it pays the bills. The trailer shows there is some degree of story running alongside the Horrid advertising. 

Check out the trailer-

Below you can read Squares  given information-

“An all-new immersive Assassin’s Festival is overtaking the town of Lestallum!
Starting on August 31, 2017 until January 31, 2018, you can partake in this limited time event, featuring gameplay elements from the Assassin’s Creed game series, mini-games, and a chance to obtain exclusive items, such as the “Medjay Assassin’s Robes” for Noctis, Gladiolus, Ignis, and Prompto.
FINAL FANTASY XV: Assassin’s Festival is available as a free download from the PlayStation Store and Xbox Store.!
The “Master Assassin’s Robes” for Noctis can be obtained via the Dream Egg, a special item from the Moogle Chocobo Carnival. The Moogle Chocobo Carnival is going on now and will end in late September, so don’t miss out on this opportunity!”