I don't have the live letter responses thread up, so I can't quote which one it is, but someone also asked about the "UFO" you can see in Sea of Clouds, to which the response was something to the effect of "This will be explained in 3.1".

Pretty sure this "UFO" will be the new 24-man raid. Whether it's the alluded-to Ayatlan, we'll see! I like the Azys Lla connection though, so we'll just have to wait! I think these three responses are all pretty closely related.