Okaay as we all know Heavensward is coming this spring (which is bye the bye a pretty short wait for an expansion that was just announced) and ammong other things we will get Ishgard as a fully functional city state.

In terms of classes that means at the very least:
- one DoM
- one DoW(usually two, but Limsa only had one till ninja)
- one DoL
- two DoHs(Limsa and Ul'dah have three, but Gridania has only two)

The two new fighting classes also mean two new jobs at the very least.

Nothing has been officially revealed as far as I know, but Dark Knight(Batman!) is taken for granted by some sites

Now the question is not what people would want, but what would fit thematically with Ishgard?

I for example think Samurai is wishfull thinking at best, but Blue Mage could be a logical answer to the dravanian threat.

What about crafting and gathering? What is the market niche that can and should be filled?