This also makes me realize that each of the towers is near primals that have Lunar counterparts from the FFIV Advanced/PSP versions of the game.

So we'll get:

Lunar Titan
Lunar Ifrit
Lunar Odin
Tsukuyomi
Lunar Dragon (Though this may just be Lunar Bahamut from Shinryu's tower location)

Only one that doesn't have a direct Lunar Eidolon counterpart is Ravana. Maybe that's to leave room for more originality for FFXIV dev team, or maybe they'll surprise us with Lunar Asura given she also has multiple arms and weapons.