I saw this coming and had a feeling this is why Ishgard had not been made available. I remember them mentioning that they did not open it up because of the changes in the battle system. This is in one of the PDFs

"Campaign of battles against the dragon horde in the defense of Ishgard, with participation possible as any of the four Disciplines."

Cannot wait. Also get ready for LAAAAAAAAAAAAAAAAAAAAAAG cries.