There was no post TMk, but I'd think it highly possible that it could come back again: Heart of the Valorous came back a second time without any prior warning, but HoV only gets you through the first part of the quest, while GotBP finishes the deal. It'd be unusual for Blizzard to send out a pair of buffs to get people through the quest in full, then send out a second wave of one buff only to leave the player hanging without the finishing buff.