Originally Posted by
Tantypops
I think enhancement appearance has also changed sources, there doesn't seem to be another hidden appearance that drops from world bosses along with blizz saying all the appearances are obtainable right now.
That being said, I went to isle of giants, the troll area in isle of thunder and cleared the troll bosses in throne of thunder to no avail. This might be a long shot, but I'll see if the waterlogged zandalari journal can be used as some sort of a clue, or maybe all five.