I doubt there will be Bahamut as Egi so soon. Story-wise, Bahamut is the summon/eidolon/esper/whatever that uses so much of world's aether that is why he was imprisoned and thrown on the sky, so it would not kill the world (and the people, as he did in the end of an era rofl).


Shiva might probably be something near Dragonhead, since it's always snowy. Leviathan @ somewhere near Limsa.