Summons in Final Fantasy XV

[スコール・レオンハート]

I can't confirm but the image that show up at the end of the demo can reveal the summons we can expect to see:

tLvQQma.jpg

I can see Etro in the top then the Knights of the Round (OMFG!!) around her, and on the right side Ramuh, Shiva, Titan and Leviathan.
On the left side we have Diablos, Siren and Kraken or Ultros. The two simetrical angels on the bottom can be Brothers.

I don't know who are the people on the middle of the image, maybe it's some reference to the ones who rule the kingdoms.
And the people at the bottom represent the common people.