They probably meant that all of your abilties will come from jobs, instead of constantly adding more onto classes.

Your new abilities in 3.0 will all be job abilities that you get from quests rather than be given to you as class abilities. The way it works right now, your current class is determined by weapon you have equipped. The new jobs have their own weapon classes so I doubt they'll do something as make you equip a soul crystal as another class.

The new 3.0 jobs are classless, not jobless as they keep saying, but honestly I think it's easier to just call them as "new classes introduced into the game"; you'd just equip the proper weapon. The whole job/class thing/terminology imo is a very stupid concept from that leaves really no room to expand upon (like trying to make DRK an alternate of GLA or THF an alternate of ROG)