I do remember them saying before 2.0 that all classes would have more than one job, and that the new class arcanist would be the beginning. However, they also said they were against the cash shop and we still got it. Whatever they said really does not matter, they change intention depending on player desires and flows.
I doubt they add a second job to the "old" classes, although if they do, I'd wish it wouldn't be like arcanist, based on diferent stats yet on traits one stats keeps getting buffed.