The WoTLK Bestiary has been updated today with the next monster in the series: the Iron Dwarf. These fearsome creatures, uncovered by the Dwarven Explorer's League in the Howling Fjord, are apparently a missing link between the Earthen and the Dwarves, an Iron-skinned race with runes of power etched on their skin. Unfortunately, they appear to be nearly as surly and destructive as the Troggs, not only fighting against the Explorer's League, but outright destroying any artifacts that the Explorer's League could find useful.
There's not too much info on them yet, only a few paragraphs and a sketch, but it's certainly exciting to see a new chapter in the storyline of the Dwarves. The Iron Dwarves look like they may be the next step in the storyline that began at Uldaman, another piece of the puzzle of the Titans, so that could have reprecussions for all races, and give us more insight into the origin of Azeroth itself. Perhaps we'll encounter more of them at Ulduar, or at the ancient Dwarven citadel of Thor Modan, or find out that they have their own copy of the Plates of Uldum or other such historical artifacts.