Obviously we don't know for certain, but from the sound of things it looks like most if not all of the new Heavensward zones will be located around Ishgard. They said that the new areas will be approximately 1.5x the size of what we have now in terms of map size. Add that to all the castles around Coerthas already in-game and that would make Ishgard/Coerthas the largest city-state in all of Eorzea in terms of land and population (about 3x as big as Black Shroud, La Noscea, and Thalanan).

Do you think this is true? Or will we probably be seeing other, new lands as well on our journey from 50-60?