He is mostly wearing the heroic version of Mage tier 11, Firelord. http://www.wowhead.com/transmog-set=570 There exists a non-class-restricted version of the set, too, but it is missing gloves: http://www.wowhead.com/transmog-set=479
The weapon seems to be Funeral Pyre from normal mode Beth'tilac in Firelands.
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