I think it's worth looking at Bravely Default II for new jobs. Bravely Second came out around the same time as Heavensward, and both featured the new Astrologian as a buffing class.
If we look at the latest job reveals from Bravely Default II, we see that they are bringing in Beastmaster to the series - a job prevalent in the Bozjan area. I think this will be another Astrologian situation from BS/HW.
Another job of note is Pictomancer - basically a Relm inspired job. If we look at the new painting emote, this could be a hint toward a painting/art inspired mage of sorts.