How can they add more classes and make them unique and have their own flavor?

[MoraClaret]

Because of the way they've structured the game, it would require taking some risks to add classes that would truly feel different or offer "game changing" elements.

Given their track record so far, I doubt they will do so. Classes will likely remain a visual wrapper to similar functioning skills with one or two unique uses.

(@Kaurie, I agree with you, I'm just stating what I believe to be the reality. I believe the devs have overcompensated in many areas due to the failure of 1.0 and have been afraid to take risks.)