I just want to say that this isnt only about the fact that you can kill Coren Direbrew as level 40+ before anyone starts the flaming.
I havent posted anything in here yet since everytime I get an idea it has just been posted. XD
Basicly what this is all about, I was on my warrior yesterday (level 46 at that time) and went with some friends to do the boss for emblems and so on, when I noticed the insane amount of exp I got from him. At level 46 I got 39k exp (as rested, which would make it around 19-20k not rested.) and at level 46 you need just barely over 100k exp to level. This exp was insane for just killing a boss. So we started grinding him and I got some nice levels VERY fast! Ill try and link a screenshot when I do it again later today.
This seems to have been fixed since it doesnt work anymore. Only the first kill today worked for me.