Moogle Lore

[Enkidoh]

1. I think it's pretty safe to assume that they're mammals and probably better to leave it at that.

2. A series of quests in Moghome during Heavensward actually dealt specifically with the legend of Good King Moggle Mog and confirmed that the moogles on the surface did come from the Churning Mists (so therefore the 'golden rope' would be a very close match to the transporter to Halo) - incidentally 'Good King Moggle Mog' was actually Chieftain Moggle, the first chieftain of Moghome:

Moglin: "My ancestor, who was Moghome's first chieftain, was named Moggle, and in fact it was he who decided which brave moogles would travel down to the surface after fire rained from the skies."
Kuplikuki: "Moggle... That name seems so familiar... Kupopo! Moggle Mog!?"
Kuplikuki: "Could Chieftain Moggle have in fact been Moggle Mog? If so... Chieftain Moglin, you would be a descendant of Good King Moggle Mog the XIIth ─ may all his lineage bask in greatness!"
Moglin: "Indeed, the two names are quite similar, kupo. Moggle Mog... I remember ─ this was the name of the king from your legend."
Kuplikuki: "It all makes sense, kupo. The legend is so ancient, it's no wonder the name changed ever so slightly! That means I'm presenting myself before the descendant of the last king of mooglekind!"

3. As Cilia mentioned above the colour of moogle poms indeed seems to differ depending on their location, with the moogles of the First apparently having blue poms (as depicted in the SHB opening trailer, in the scene in the Crystarium moogles with blue poms can be made out next to the aetheryte), the latter very much in keeping with the First's depiction as being a 'bizzaro-Hydaelyn'. Of course Square Enix Visual Works (who actually are the ones who produce the CG opening movies, not the FFXIV Team themselves) often do make mistakes due to using innacurate or early information or designs that change after the CG trailer has already been produced (Hraesvelgar appearing as the antagonistic dragon during the Battle of Ishgard instead of Nidhogg who it actually should be in HW's opening is a well known example of that), but I'm pretty certain in this instance, it is indeed accurate, and that the moogles of the First do have blue poms.