Glad to see I'm not the only curious about Yotsuyu's past. Seriously, that Echo flashback and what she says at the end of Doma Castle have a few potential timeline disrepencies with each other. Flashback shows her "aunt" talking to an Imperial soldier about her son's future in their apparent schools, younger!Yotsuyu shows up and Imperial starts questioning, "Hm, you only have one kid registered, who is this?" "My niece, I swear." "okay....", and then some arrangement gets made. End vision. Later Yotsuyu brings up her mistreatment by her mother, father, and brother (odds are those were the "aunt" and "cousin" in the vision), that they forced her to marry someone to get their family a better position, he died with tons of debts forcing her to pay them off as a prostitute..yet the guy in the vision clearly lived (until Alisae protected us from him). So, either that guy wasn't who she was forced to marry, he was not quite as dead as she thought, or we're getting two sets of lies that are headbutting with each other.

As for where 4.X could go: I can totally see it just being, for the first three patches anyway, the restoration and rebuilding of Doma and Ala Mhigo, with 4.4 and 4.5 being our set up for 5.0. Will we get to see Thavnair, the Burn, and the island of Sharlayan in 4.X? I don't think so. That would likely mean adding another set to the Aether Current zone list, which is possible, but unlikely until another expansion. That and the in game world map does not show Thavnair, or Sharlayan proper. As for "The Burn" to the south of the Nhaama desert (which itself is partially in the Azim Steppe), I could see that being either a dungeon itself (Xelphatol dungeon vs zone says hello), or being part of the Return to Ivalice raid depending on where Rabanastre and Dalmasca are (if they're going to be connected to the Ivalice raid as well).