While I could see Garlemald restoration working in a similar manner to Ishgardian's or the Doman Enclave's, I doubt we will see a significant outdoor change. Unless SE wants to have the hostile NPCs casually strolling around restored buildings and unsuspecting citizens. Not to mention the zone would be pretty much cosmetic in nature and with less purpose to visit than before, which would pretty much be a waste of effort from the designing staff. It wouldn't be crazy to assume that returning Garlemald or Yangxia to normal will take years, meaning the changes will pretty much be sorted out on the background and after whatever definite end to FFXIV story there might be.

And, personally, we already have a cold and snowy residential district. Even with the magitek infrastructure going on, it feels overkill to me when there are many other, more distinct, options.