http://www.wow-europe.com/en/burningcru ... azhan.html
1) Go to the tower where the karazhan dungeon is.
2) You will see the instance but it is blocked by a gate.
3) Down below you will see a crypt entance with another unpassible gate.
4) Pull a ghost and let it kill you.
5) You can rez on the other side of the gate.
6) Go see the new karazhan dungeon.