Hints at new class? Maybe?

[Renato]

It's probably too early for hints. A new expansion will probably come out next summer, but we likely won't get any info about it until at least E3 in June, Tokyo Game Show in September, or potentially Fan Fest 2018 in November.

If we are going to Thavnair, there's a very very high chance we will at least get Blue Mage, given its near-eastern aesthetic and the fact that Blue Mage and Blue Magic has already been name dropped several times already. I have a feeling that Alphinaud will be the Scion's Blue Mage as Alisae was the Scions' Red Mage. He wears blue a lot, and has a blue hair tie. This is the very first time we ever meet the twins. Notice both of their color schemes. It was already foreshadowed that Alisae would be the Red Mage.

Pretty sure the next job is going to be a Gunblade-themed class.
Someone also threw out the possibility that the it could be a play on a blue mage but based off of the x-2 version otherwise known as the Gun Mage. "ShadowHunter" could also be a play on Fiend Hunter which was a special skill of theirs. If your theory is correct (which would blow my f-ing mind that this was planned out so far back) This would make sense as Alphinau could possibly pick up the job from being around Shadow Hunter.

SE has been known to hint at future classes i.e - Thancred/NIN and Alisae/RDM.

I'm sure Geomancer will show up eventually but that last scene in the MSQ can't be for nothing.