I expect we'll see;

3.1; Void Ark, Mhachi connections.
3.3; Floating City of Nym, Nym connections.
3.5; West Shroud/Ancient Eorzean Stratum (that's what it was labeled as on early concept art IIRC); Amdapor connections, since Amdapor Keep looking out on it so perfectly has to be more than just a coincidence, right?