According to live test realms all Warlock DoT damage has been reduced by 30%. In addition, Curse of Agony and Corruption are no longer instant casts (not even by talents). Soul link has also been reduced to 20% damage reduction down from 30%.
The damage reduction I can see and agree with.....but making CoA and corruption have cast time??? You have got to be kidding. DoT's are easily dispelled by instant casts, and they take 30 seconds to do their full damage, so they are easy to heal against as well.
Can't blizzard ever just make minor adjustments to balance things out istead of completely changing the way a class is played? A damage reduction in itself would have sufficed. I swear everytime I start to enjoy a class it gets flipped upside down by changes. Once you start making a time investment it would be nice to know what you are signing up for.