The lore, as I've said in previous posts, seems to indicate that the Meteor is going to impact Silvertear lake most significantly [either impacting there and being destroyed into fragments by the aetheric concentration, or repelled using some sort of devastating cannon that harnesses aetheric concentration], this is furthered by Yoshi's recent post to pay attention to the Monk storyline.

This is important because underneath Silvertear is the crystal tower holding the remains of the first emporer of [something I can't think of].

Mor'dhana might make the most sense for this base. I'm personally most excited about this in the patch, since I'm a sucker for Magitek.

I don't know that the Thanalan area makes the most sense, because even though the Cerulean extractors are there [and they will be there in 2.0], most of the Garlean focus is towards the Gridania area currently.

I'll be glad to see that area going into Thanalan though if that's what they're putting in, because it looks really neat.