So... 2 Jobs one Class?

[Bebekurenai]

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.

[Jacost]

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.

They probably changed their minds when they saw how much of a headache balancing the two was. That said, I think they've said that classes won't receive any skills at all post-50, and it's all job skills from that point on. If that's the case, then I can see that by the time the level cap hits 75 in 4.0 (that's just a guess), jobs with the same base class will only have about half or less of a shared movepool, which makes it much easier. Heck, they say that a lot of new skills are coming in 3.0, so maybe it'll happen sooner than that.