My expectations are so low that I half think Garlemald and/or Fandaniel are going to blow up Ishgard Housing before we can move in; or that it'll just somehow never be mentioned again and be home to only the NPCs.
Short anwser, no. Long anwser nothing is confirmed so wait until it comes out.
So let me guess:
- Non instanced islands that requires millions of gil and hours of spam clicking just to attempt to get one? Or is is confirmed that it's instanced (like housing should have always been)?
Be very surprised if it's not something that can be acquired by everyone. I suspect there will be a quest line to to to unlock them and maybe additional ones to unlock some features. One can hope there will be gardening that is similar to what can be done with private and fc estates but that may be wishful thinking. One can also hope that there will be some deco related features as well.
I suspect we'll learn a lot more about them at the next reveal in May I think it is.
I can totally see the new content taking place in The Cieldalaes.