exploring demonis

[secondbest]

Well I've just finished the Tear of a dragon quest. But no matter where I went I just couldn't explore whole of Demonis. Nearly half of the map is still clouded. Also you can travel to Hades and explore most of Hades but I think there is a patch at the top of the map right in the middle. You can't travel there also. But maybe it is just empty space and there is nothing under there only the cloud is there because you haven't been there.

Also in the Hades map there seems to be a portal that is labeled New Kordar but when you go there there is no New Kordar destination.

Does anyone know if these are bugs? Or is it that it is me that couldn't explore the map? Or that we can go back later in the game and the maps open up then?