He's now @ Sunwell Plateau on the Isle of Quel'Danas. Kael'thas abducted him and carried him off, where he has become one of the last few raid bosses in TBC.
The Blood Knights now draw the power of the Light directly through the Naruu with their consent, as is demonstrated by the conversation that Lady Liadrin has with Adel in Shattrath City's Terrace of Light ever 10 minutes or so.
Edit: Plus we ate him
Edited, May 27th 2008 12:29pm by Losie