For all you Warlocks out there, the Feat of Strength and associated title 'Of the Black Harvest', both rewards for the green fire questline, will not be available anymore once WoD hits. The questline will still be there, so the green fire will still be obtainable after the WoD launch. The FoS and title however, won't be.
Keep in mind that this FoS and the title are not yet available even if you did the green fire questline, but will be awarded on the day WoD hits if you completed the questline beforehand.
So if you want the Warlock-only and account-wide title + the FoS, you have to do the questline before WoD.
FYI, the questline starts with Sealed Tome of the Lost Legion - Item - World of Warcraft
Sources:
Of the Black Harvest - Title - World of Warcraft
Breaker of the Black Harvest - Achievement - World of Warcraft
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