Debuff limit going from 16 to 40 at BC

[Genoism]

And i quote blue:

I will say this, for expansion the debuff limit is being increased from 16 to 40, combined with the focus on smaller raid dungeons, Warlock players will have more freedom and opportunity to use their debuffing abilities with less limitation. Beyond this, all classes will have new spells, talents and abilities that they will bring to the table by the time level 70 is achieved.