So I'm pretty sure somewhere along the lines the plans for a larger Gun'drak raid was scrapped by Blizzard. The zone itself is a progression to a temple we don't even get to enter on the NE side of the map. Frost King Malakk wasn't even put into the game at all and to top off I'm almost positive they had a Snake boss planned for this.. the tail being in Gun'drak after all.
Maybe I'm just saddened by ZG being removed so my mind has wandered but I'll miss Troll raids