Looking at the banners, most of them hint at their respective Eikon.
Rosaria shows Phoenix, as expected.
Sanbreque shows a woman and two dragons. Shiva and/or Leviathan seems the most likely bets.
Waloed shows a horse's head and six legs. Definitely Odin's horse Sleipnir.
Dhalmekia shows Titan, but more interestingly icons representing the four main elements and an additional one.
Iron Kingdom is a lot more vague, but given one of Clive's abilities in the trailer and the lack of wind representation I'm gonna go out on a limb and say Garuda for this one!
Crystalline Dominion also shows elemental icons, each representing a nation and their seat at the table there. Odin is clearly the odd one out, lacking in elemental attributes.
It also shows four crystals at the bottom.
Now this leads me to believe that we're going to see the return of Light Crystals and Dark Crystals, a concept from earlier Final Fantasy games. With Ifrit being described as a Dark Eikon, I would guess that every nation except perhaps Waloed is in possession of a Dark Crystal - or something to that effect - and that perhaps Sanbreque is also privy to this truth, hence why they possibly have two different water/ice Eikons pictured in their coat of arms.
That leaves a Dark Eikon of Earth and Wind respectively, although they might go for totally different elements with the Dark Crystals. If that's the case, the dragons of Waloed might be Bahamut rather than Leviathan.
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