Blizzard has updated the class tuning post, noting that the Demonology Warlock Nerfs are not affecting PvP combat.
Class Tuning – March 28th
Added clarification to two notes above:
Demonology
Demonic Strength now increases the damage of Felstorm by 300% (was 400%). This does not affect PvP Combat.
Dreadbite damage reduced by 10%. This does not affect PvP Combat.
