Not sure if you've done the Wauqamekimeki (Crafter/gather) story quests yet...

But, today I learned through the MIN/BTN one that there's a icy country above Othard past the burn, that's also near Illsabard called Kaguma (I probably butchered that). Where Viera live, the name of said tribe escapes me, and also hid during Garlemald's expansion. One of the NPCs tells that story during the lvl 93 portion of the quest. That's as far as I gotten though. I think this one of the areas Emet was talking about during his bucket list speech. Think this is the first time we get a couple names to the areas, so it's possible that could be a destination in a future expansion. We're due for another winter themed expansion.