I too have the feeling that they are going to get rid of the class system (wonder what will happen to DoH and DoL then), or get as far away from it as possible. The introduction of jobs in he first place was a step towards this, what I don't know is if that's the way Yoshi want to do things, why didn't he just did on ARR release.

But if classes are going to stay and they'll add more in the future (I guess we'll know in Dec 20), that the other possibility is that DRK will be like what Death knights were in WoW, some special job that starts at a higher lvl, to encourage new players to jump right into the game on the expansion and have a lvl 50 job to o play with their friends, and a Tank no less, so then alter on when they are already hooked they can go to the old content and unlock all classes and level up 1-60.