is this a meme? or was some information teased somewhere?
Wishful thinking. Before Geomancer was added, SE added a AoE party buff system from equipment (Sphere effect) to likely test implementation of what would later become Geomancer bubble effects.
Now Monbereaux was added and uses Mixes as his method of healing which is taken from a classic Final Fantasy "job", the Chemist; as if to test that sort of new job mechanic out.
With SE teasing "some big announcement 2 years from now", and I believe I read in a dev panel that they brought in some former storyline writers/editors from early game content, people are speculating some sort of addition; likely a mini-expansion.
SquareEnix staff just love to not flat out come right out and say what they are doing because their widdle e-peens get hard to the idea of "secrets they can't reveal yet" for an 18 year old game. I think it's a Japanese culture thing because they have consistently always been really hot and bothered for content they "want players to discover the answers to themselves".
To the people that are going to say "Well, SE panels have said they can't do any more expansions", I simply remind them that the inventory used to be capped at 60 and "they couldn't add more inventory" and yet... here we are years later and they bumped all inventory up to 80 slots, added multiple wardrobes, Satchel, Sack, and Case. Basically, I don't really believe what they say their limits are. They are merely limited by the narrative of what they can say they can deliver, however... I'm sure they can push more out of this game still. Even the 3 mini-expansions didn't add new zones or jobs. They just used old assets and barely added anything more other than event flags for the story and a very limited number of new dat models. They could likely do it again and I'm pretty convinced that is what their plan is.
We just have to wait and see.