The news is here:
http://blue.mmo-champion.com/topic/2...ire-questline/
"Yes, it's happening, and next PTR build you should be able to test it. Please use this thread for your feedback on the experience, and please expect there will be spoilers here.
(Please do not use this thread to discuss other warlock or non-warlock related topics, including but not limited to, your pitch for a quest line for your class.)
To begin the Black Harvest questline on the PTR, you can find an item that starts the quest as a drop on the "Green Flame Infernal." When 5.2 goes live, the item will be rarer but not stupidly rare.
Known Issues:
1) At one point you will be asked to speak with a Warlock trainer. The quest is not hooked up to every possible trainer, so keep talking to trainers until you find one.
2) At a later point in the quest, there is a timed element. In the current build, you must finish the trial within the time frame given or be forced to redo it. In a future build, you will be able to proceed even if you fail the time check. This will make sense when you see it."
The time trial thing is ... interesting !