Found something interesting.
I was running through the ADV guild in limsa, intending to go down the stairs on the north side of the room that wind down to the bottom. When I ran up the first section of stairs in the Adv guild, I somehow fell through the stairs at the very top and ended up running right through the outer wall of the second level. I was standing out in the middle of the air in limsa, free to run around the ENTIRE second level of the zone without falling through the sky. It happened to me on Ul'dah's stairs also once. It seems to happen when I run into a new area and the PCs and NPCs are busy loading, the game gets glitchy.
So anyways, I took this as opportunity to run around and explore all the parts of the city we can't get to. I ran across the sky to just about everywhere on the map. It was very fun and I could go anywhere because I was about 5 feet below the second level, making it very easy to simply walk directly under all the walkways of the second level. All of it seemed 'as it should be' until I went over behind the armorer and blacksmith guild.
I went over to that area that is blocked off behind the Armorer and blacksmith guild. If you were standing at the guilds themselves, you can look down over the balcony and see ships that look like they are in contruction. Well, I skywalked my way all the way over to those ships and stood hovering above them at about mast level. There are already sounds of several (I'm guessing) NPCs working on several things. You can hear several different types of hammering and sawing going on in these ships. Are these the ships we will be able to build? They never actually said 'air' ships, they just said company ships I believe. In addition to the sounds of several people working, I think I could hear the 'buzz' of several people talking, but I can't be sure of it. After my second lap around the city, I got a little too close to the ledge above the archway you would go under while running back into the lower level of the adv guild from the east bridge. It registered my feet on the ledge, and then, when I tried to walk off of that, I fell down to the bridge, sad face, no more Jesus walking.
I have some screen shots, but they are on my desktop, and I'm typing this from my laptop. If I get back to my desktop, I'll try to remember to add a couple of them. I thought about not posting this because I didn't want to get in trouble for alledgedly wallhaxing or something, but it's their glitch, I think I'm safe.
It left me wondering WTH is going on in there?! I must know. Remove the gates!!