MMO-Champion previously unearthed this armored Frost Wyrm model along with spells named Frostbrood Vanquisher and Frostbrood Vanquisher Flight, which could give some insight into some Icecrown Citadel encounters. Despite the confirmation of new reward mounts (expected to grant 310% flying speed, as well), there is currently no word on the removal of the Ulduar reward mounts, which Blizzard has said to stay for "the foreseeable future".
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Patch 3.3 PTR: Armored Frost Wyrm mounts are rewards from Icecrown

MMO-Champion previously unearthed this armored Frost Wyrm model along with spells named Frostbrood Vanquisher and Frostbrood Vanquisher Flight, which could give some insight into some Icecrown Citadel encounters. Despite the confirmation of new reward mounts (expected to grant 310% flying speed, as well), there is currently no word on the removal of the Ulduar reward mounts, which Blizzard has said to stay for "the foreseeable future".