When the troll raids Zul’Gurub and Zul’Aman were revamped as 5-man dungeons in Cataclysm, much of the of the original gear was either removed, or recolored for the updated loot tables. Since this was before transmog, not many people had the old gear hanging around. Blizzard seems to be keyed into how much people love to mog old sets though, and they have brought these back with the introduction of the Isle of Thunder! All of these items drop off of mobs on the island, and except for the Corroded Hacker, they are all BOE, so check out your local auction house if you’re not able to visit the new dailies hub yet. I really love this idea of re-introducing removed gear as random green drops. I’m keeping my finger crossed that the old Scholomance and Scarlet Monastery gear re-appears soon. In the mean time, check out these fly sets
For more info, check out wowhead’s write up of all the drops. There are a ton more
weapons, a red and purple recolor of the Amani Regalia, and some pieces that were
missing from recolors of other sets.