Square Enix and Sega are teaming up to do a Final Fantasy XIV crossover with Phantasy Star Online 2. This event will pit PSO2 players against a long time summon in the Final Fantasy series, Odin.
A trailer of the battle has been posted to YouTube showing PSO2 players ganging up on the powerful new enemy.
https://youtu.be/BucQC7USvfM
No word on what PSO2 additions will make their way into Final Fantasy XIV as of now, but we will keep an eye out.