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The armour sets page has been updated with all of the new sets of armour that has been added in WotLK, check out the official news post confirming this:
[quote]We have just updated our Armor Sets page with the new sets added in Wrath of the Lich King. These sets are available to adventurers who have taken the fight to Naxxramas in both normal and heroic mode. Also, the new Arena Gladiator sets that came with Wrath of the Lich King have been added. Take a moment to check it out! [/quote]
You can see the new armour sets page here