An Atetherial wheel was mentioned at the FFXIV fan festival shown here:


But they didn't go into detail what it is or even what it relates to. But I do have one theory:


This is the only thing I can come up with. The primals which bacillary run on aether are all element themed. This can apply to players as elemental attacks, defense, crafting ect.

But what do you guys think? Have a different theory?