Was on my rogue last night, making my way to the temple of Jintha'Alor in the Hinterlands, when a guy from my guild whispers me "Does Ruin want to come fill the 10th spot in kara?"
I ask what boss they're up to, he says Moroes, so I say "Sure, why not"
We down Moroes, The cloak of Arathi Kings and the tanking belt drop.
While I did so want the cloak, I was the only other warrior in the raid (MT already has pretty much every tanking piece from Kara) So I let the MT take the cloak and I took the belt, which has actually made me want to start collecting a nice tanking set.
Unfortunately Maiden didn't drop any tanking gear (last run I went on she had dropped both tanking pieces which went to the same warrior, who was overly stoked) and we didn't end up downing the opera event (Bad mix of classes + Wizard of Oz).