I missing something or.... (new class/job expansion)

[Nalien]

It has been confirmed that the Machinist, Dark Knight, and Astrologian will be so from level 1 to 60. They have no base classes, they are purely jobs.

I suspect they'll still have a base Class, just not in the current sense. You would, for example, need Lv30 Gladiator to unlock Dark Knight, but Dark Knight is Lv1 and has its own set of "base" moves, instead of piggybacking off Gladiator like Paladin.