So in today's live letter, this was mentioned:

Q30. Is the Iksalion that appears in the Fractal Continuum related to the Ixal? If so, is the Ayatlan they are searching for during the beast tribe quest actually the floating continent Azys Lla?

A30. Azys Lla, Azyslan, Ayatlan... Talking about it too much would take the fun away from it, so I think I’ll leave it at that. By the way, if you go and talk to a certain NPC in the Ixal beast tribe quest area after clearing this, their dialogue will change. There are a lot of other examples of this, so be sure to check out various NPCs.

Then in a later response:

Q46. Can you tell us about the new 24-man raid?

A46. It’s still a bit too early to discuss this. We’ll be releasing some information during the Letter LIVE that takes place during the 2 year anniversary stream. There is a hint hiding in something I said earlier.

Are we going to Ayatlan for the new 24 man raid? What are you thoughts?

Here are a few theories that were posted on Ayatlan months ago:

http://forum.square-enix.com/ffxiv/t...187721-Ayatlan