It will most likely be Ishgard wards, an increase to the number of wards, new subdivisions, an increase to the number of available apartments, an increase to the number of items players can place inside their homes, and a lot of new furniture (hopefully, some for apartments in mind since some of what's available is just way too big for apartments). And, all of this really just depends on just what the PS4's limitations are. We might get balconies, or mirrors. But, most of it will go to item storage and new areas and mechanics, so we'll really just have to wait and see what will be available in 4.0, tbh.