Let me reiterate that last part:
”Once Warlords of Draenor launches on November 13, the Legendary Cloak quest line will be gone entirely—the quests and the cloak will no longer be obtainable, and any related in-progress quests will be cleared from your log.”
To add insult to injury (you can’t disenchant or vendor the cloaks) I bet they’ll remove the Blacktalon Quatermaster so there will be no way to get the cloak back if you destroy it.
Fuck I just realized this means I won’t get to see Wrathion stomp around the inn like the two year old he is forever.