Patch Notes on preview 29.October:
"Scourge Warlock: Tyrannical Curse: The damage-increasing effect of this power no longer incorrectly scales with the player's power.
The effect now consistently increases the damage affected enemies take by 20%, as indicated in the daily power."
Some will call it a fix, I call it the last nail into the coffin of this class.
Since now Warlocks could stand against GWF, CW and Hunter running dungeons, the class was "in line" with some gear doing FBI, some GWF and CW´s beat you, some lost.
This little change will result in a very, very big effect on the hole class. Effectiveness will fall from 230% + average to 130% average solo, in a group it will get worse I assume, this is a > 100% damagedrop, every CW, GWF and Hunter will beat you with ease.
Spikes in effectiveness like 400% are done, 150% is the best you can get solo. The hole class will be from minor interest in former mods, if nothing is done to compansate this. I advice everyone to look for alternative classes in mod 10.5 .