02-26-2009, 09:07 AM
My assumption is that this mount and the Rusted one are the Raid Achievement Rewards for 10 and 25 man Uldar. It would make sense. For the noxious plague cloud themed Naxx you had a Plagued and a Black Proto-Drake. And here for Uldar which seems to have a mechanical lightning "gnomes gone wrong" feel to it you have the lightning laced Ironbound and Rusted Proto-Drakes.