Blue Mage! Wouldn't it be great to have Blue Mage in this game? There's a lot of demand for it!

Huh? What's that you say? LALALALALALALALA!!! I can't hear you! Yessir, it's about time we finally got Blue Mage, yep!

...

More seriously, if I had to guess, I'd say Geomancer is a strong contender, given that it's already been confirmed to exist in the world of FFXIV. It's mostly a matter of fleshing it out as an actual player job.

However, I doubt that GEO would be a healer, as that would make it too similar to WHM/CNJ (two jobs that heal AND use wind/earth/water magic?), and anyway, the NPC Geomancers never cast healing spells in the questlines they appeared in nor were they implied in any way to be healers. (They were "guardians", and their magic "compliments" Astrologians' - sounds more like a tank, to me!) Given that there's nearly riot-levels of outcry for a new healer, I'm guessing we'll get one. Chemist might make an appearance, as it's a popular request AND it's a healer. If not Chemist, I'd guess some other classic job that could be retooled to healer, like Templar, Sage, or Oracle.