I don't see why they would need to make a new Ahriman
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The mount is just an Ahriman and the Voidal Resonator is the item that is used unlock the mount like a Chocobo Whistle is used so you can unlock Chocobo mounts.
As for the Black Chocobos, two things. First they existed in the series before and the whole point of them was that they could fly, therefore allowing the player to reach new areas, so them flying in the expansion is par for the course. Second, pretty sure they will not be a mount that you acquire via the story like your Chocobo companion, as that will be a certain story related dragon. If you look at all the pics and videos of them they appear to be wearing something akin to the Chocobo Porters, so I'm pretty sure that is what they will be, flying Chocobo Porters and not a standard mount.
Good news! Looks like I was incorrect on our own companion being unable to fly:
http://forum.square-enix.com/ffxiv/t...57#post2896957
Also, the Bomb Palanquin and Ahriman mount will be usable, just not on release. :)
Bomb Palanquin being a flying mount? Even if it looks incredibly lofty and haughty when I ride it... Hell yes.