I don't get all this 'hate' on classes. Like they cease to exist or something once you unlock a Job. Classes DO STILL have a VERY IMPORTANT role in the system even after you unlock your Jobs. They form the BACKBONE of the Jobs, you can't have the Job without the class. Those stat points you spend, those are put into the classes. Just ask anyone playing Summoner/Scholar. Further, not one Job ability is gained through leveling, not a single one. You have to quest for each and every one, all the abilities gained through leveling is gained by the classes themselves.

"But what of Dark Knight? That's not going to have a class." True AND false. Dark Knight will likely require people to have unlocked specific Jobs, but it will still be bound by levels. Levels are a feature of classes. Meaning one of the unlocking Jobs will be the Job that Dark Knight takes it's levels from, meaning it will still be tied to a class. The only way around this is if they make Dark Knight 'leveled' entirely though questing.