Dragoon... Paladin... monk
All of these jobs are similar in technique to the classes they sprout from....
But in their philosophy they differ greatly...
So....
Ishgard is run by a religious zealot bishop and is devoted to the fight against dragons
Paladin has always had religious (holy) overtones
Dragoon has always been either one who battled with dragons or one who fought against dragons. It changes from game to game
Monk is more spiritual than religious really and doesn't really seem to side with Ishgard but (And this is a stretch) could be a part of some resistance group opposed to the dictatorship of the Bishop
This is all just wild speculation but could the new jobs tie heavily into Ishgard?
The soldiers outside of Ishgard claim that you need the blessing of Halone the Fury to enter the city (Halone being the guardian deity most associated with Gladiators) which could tie into the twelve, Archons and Umbral era's and all that jazz
If Ishgard isn't introduced this way, I wont be mad, but I'd love it if it was