As far back as the beginning of Stormblood, the first mention of Geomancy that I had found was in the Level 60+ Astrologian quest line. Upon working on the 4.3 patch, I've seen that the newest dungeon literally shoves the elements of Geomancy in your face & I recall a brief mention of it in the 4.3 story quests.
I don't know what to think here, but could Geomancer really be one of the next jobs we unlock in 5.0? Could this be a gigantic misdirect and never gain the ability to become a Geomancer?
Personally, I would love to see how the job works from a player perspective. Given that water and wind appear to be the job's main elements, I would assume that Geomancer could have access to Water I-IV (or potentially V with a level cap bump to 80 in 5.0 if added with [insert 5.0 expansion name here]). Part of me also thinks that we're being set up to get trolled and not get the job at all, but I could always be proven wrong.