During an interview with Famitsu after the NA Fanfest, YoshiP mentioned some info about Job specific UIs. Below is a summarization of what was said:

There are considerations (though the Japanese article said "close inspection", meaning they are looking through it in detail) on whether each jobs will get their specific UI or not. Like DRK has a specific DRK gauge bar, and from there DRK players will manage that bar. The image is something like that. The UI interface graphics will be different depending on what job you use, as well. Like if MNK, Greased Lightning will have 3 orbs like Mantra located somewhere on the screen, first orb will lit when the greased lightning stack is 1, and then if 3, if shines brightly, something like gauge getting filled up in fighting games.
I'd like to see something along the lines of the above mention for MNK, to be appied to NIN. Make mudra passive rather than active, tie it to combo finishers. After each rotation one of the mudra signs will light up, upon gaining 3 signs, you can then cast Raiton, etc. A feature like this could get me back into playing NIN, nine times out of ten my internet connection is perfect, but every now and then lag spikes will completely screw me on mudra casts.