Big set of Warlock Changes

[Lissa]

Blizzard finally recognized the problem and it was the negative resistance thing.
Blue Post

Basically, the summary is that they're putting ruin back to 100% bonus, but in 1.9 they're changing the resistance debuffs to not go below zero, but they will also add the ability to increase damage to the target a little bit.  It'll bring down the amount that the damage is increased when using the spell (since there won't be any of those double base damage crits), but will still make it usefull across a variety of targets.
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Yep, just saw the post. This might also help PvE play as well because if you can't go negative, this means that the debuffs the core hounds use on occasion won't outright cause some players to shrivel and die if the core hound happens to turn their way and breathe before they get decursed.