Probably not. We may add additional areas if the player base grows large enough to be able to easily support more than two areas, but this seems unlikely.
If it were to happen, we would probably look at suitable locations in the areas bordering on the King’s Landing region, such as Storm’s End. We may also consider another city, in that case Oldtown.
The North (including the Wall) and the Iron Isles will never be featured on the game.