Hearthpwn

Gotcha, thanks.  I remember my bro mentioning that raid to me.  

What seems weird is that the other wings are named for raids/dungeons with "bosses" referring to encounters.

For example, blackrock depths has "grim guzzler" as the first "boss" but in game that event had like 3 or 4 bosses.  Ditto with the arena and dark iron emperor encounters.

I suspect each molten core wing will include a few bosses.

Therefore one would expect the fifth wing to be "blackwing descent" with "the hidden lab" as the final encounter.

I only played wow through The burning crusade, so I don't understand the final reference.