So in many interviews that I recall, they ave constantly said things about changing PLD in particular.

Now that gave an idea about what kind of changes they are going to bring.

http://www.dualshockers.com/2017/03/...ments-paladin/

So know we know that paladins are going to get some sort of magic defense buff but since we still have 3 months to go, it's ambiguous to what it entails.

Also I remember changes to warrior offtank but I couldn't find the interviews talking about that.

We also don't know how DRK is going to be affected with this change as well.