Job Wheel!

[Obsy]

The problem is that Arcanist is not a job, and only jobs are depicted in this wheel.

Exactly. Unless it's disproved later, it's pretty much inferred that the Summoner job (which is shown at about 9 o'clock on the wheel) is derived from the Arcanist class (which wouldn't be represented here).

I'll cautiously keep my hopes up that Ms. 3 o'Clock really is a Scholar, and that this is what fulfills Yoshi's mention of rounding out mage-type jobs in ARR.