Pretty sure they addressed this is the centaur stretch goal, that due to limited people working on it they chose what classes to make locked and others are both, and want to go back to make the locked both when they time allows.
Wish I could shake this feeling in my gut that we are looking at the worlds most expensive vaporware. I REALLY hope I am wrong, but its just hovering in my mind that we will never see a game out of this.