I imagine Ishgard to be similar to the other cities: a levequest counter and a market ward and some space to craft.

Apparently Ishgard is waging a war with the dragons so perhaps we could see something like that (a war against dragons). And apparently it's run by some crazy church man who's in love with the fury and enlists/drafts soldiers from the nearby hamlets.

Anyways.

I was also thinking that perhaps Airships and Chocobos had been put on hold until the release of Ishgard. Similar to Jeuno, there might be related Airship and Chocobo quests that can only be done in Ishgard and this has therefore meant that we couldn't have one without the other.