Did anyone ever figure out the "spoilers" in the Zodiark/Hydaelyn artwork?

[Iscah]

The logo for the expansion isn't Ultima Thule at all, but is in fact the Moon - this is proven by the title screen outright showing the Moon looming over Hydaelyn which then literally turns into the logo - if SE wanted to hint at Ultima Thule they would have done so.

Just because they placed one circular logo thing over a different circular thing in an image does not prove that they are the same thing. On the contrary, it's why people assumed it was the moon until they got to Ultima and saw the dead, hollowed-out planets. There's no need to hint at it beforehand – just put it there and let people realise that's what it is when they arrive at the context.

The Cradle of Darkness does not take up that much of the moon's surface, or it would have been very visible from the planet.

All the talk of the moon's importance turned out to be a red herring. Still somewhat important but not the centre and goal of the plot we assumed it would be.


Edit to add: I also have a vague recollection of Yoshida hinting in a pre-release interview that the logo might not be the moon.