Gamerescape's Lorecast interview with Koji Fox!

[PArcher]

Also it seems that Louisoix had to have his summoning ritual suppressed in order to prevent the twelve from actually appearing. So that means louisoix had the ability to summon them if he wanted to ? Or was he just trying to prevent false versions of them from being summoned ?

If he let the summoning finish, he would have summoned Primal versions of the Twelve, not the Twelve themselves. Those twelve Primals would all have been immensely powerful (thanks to all the aether and crystals used in the ritual) and would have cause a lot of destruction just by being in existence (basically, a real Eorzea-destroying Calamity. Remember, Primal drain aether just by existing, and the more powerful the Primal the more they drain. And we've seen the effects of imbalanced aether on a smaller scale than what this would have caused...)
That's not to say anything about what these Primals would have actually done after being summoned...

[swiss_Momo]

Rabanastre and Dalmasca apparently exist somewhere in Eorzea, oh, Koji Fox, why you taunt me so?

...That's where Viera are from and no one tell me otherwise >_>

Actually, I remember Dalmasca being namedropped twice already.
First in the mentioned early cutscene by the technician/spy who gets killed by Nero (they actually kept that in the German version)
Second time was by what’s-his-name who lives at the severed string in eastern La Noscea. He tells you he wants to go home to Dalmasca one day at the end of his Moogle postman quest

[Belhi]

I actually found the reference to Ascian's true form as interesting. I've always seen them as human like spirits that simply possess others kind of like people with the Echo which have transcended their original form. That they had a 'true form' and its rather monstrous is very curious. Were they in fact originally mortals that changed? Or are they something else originally? Is that the situation which people with the Echo? Given enough time, if we lost our original body, would the WoL have a 'true form'?

[Zohar_Lahar]

I get the impression Ascians are Liches.