While we are almost definitely going to Ishgard in 3.0, I am also of the sneaking suspicion that we will also be investigating the whereabouts of the Isle of Val, where the Students of Baldesion were studying before the entire island disappeared. Heck, that could end up being what 3.0's CT is. Technically original story content, it would have some heavy FFV themes.

Some backstory on Val Castle from FFV for reference: http://finalfantasy.wikia.com/wiki/Castle_of_Bal