From Twitter:
Nurse:
You've been in a coma for 10 years.
Guy:
Can't wait to play FF Versus XIII.
Nurse:
It's FFXV now
Guy:
How is it?
Nurse:
Not out yet.
Lol
But it's also so sad... D:
Can you spot it in Amano's ugly swirl of vomit?
This turned out to be so far correct regarding summons/bosses/super bosses that were in the game.
I still can't believe they made this an official promo art and even adorn the Deluxe Edition with it. Alright, no Deluxe Edition for me then...
Another much nicer official art that could tell you if your favorite summons are in, is this one:
This depicts the mythology of the game. It's obviously heavily inspired by the Last Judgment.