Question to anybody that knows/understands and can clear this up for me. Is Arcanist the new class, a new job like WHM, BLM etc. Or is it like THM, CONJ etc.?

Since I know they said that SMN might be ready for release, will Arcanist be one of the jobs needed to obtain SMN, like how you need PUG and THM(Lvl. 15) to get get MNK?