Well, seeing Darklander in the East Shroud was a bit of a dead giveaway, looks like they were standing near that spot where the fallen garlean ship things were. So perhaps my Sylphlands dungeon theory might hold up if Thancred and the girl run in that direction only to get cornered by the Twelveswoods and abducted or something.

Also, since I got around to finishing Midas over the weekend (first saw the fight and said "nope" but realized that I might want a second job and would rather not do a second anima) and now we see the Illuminati gained control of Alex and reversing time around it... so could it mean the barrier might eventually fade and Alex will crawl up and start walking? Or maybe float in mid air like the fortress from Chrono Trigger. Hopefully the final boss of Alexander would be some form of himself, where we take on the larger left arm, right arm, then it's face all outdoors but in some instance. That would be a nice change of scenery.