It it the moon after all (in the logo)?

[Enkidoh]

It's the Moon (originally the 'Primary' Moon when Dalamud the 'lesser' moon was still around), the full CG trailer released earlier in the year actually shows 'Derplander' on it at the end when he kills that boss from Amaurot in ShB ('the First Doom') then does a cool pose with the planet Hydaelyn behind him, the view then swings around to show the moon in full before it turns into the logo, so yeah, it's pretty clear it's the Moon.

And yes, the wedge-shaped spaceship is clearly showing how we probably get there (probably an ancient Allagan vessel, as it is already in the lore that the Allag had space travel - the Allagan Ragnarok-class internment hulks shown in the Binding Coil of Bahamut are actually spaceships).

Also a sneak peak of the new main title screen for EW shows the planet Hydaelyn on the bottom left corner of the screen with the moon in the logo to the top right, all but shouting the logo is the Moon. So it's pretty clear cut.