Nice, i think i will to try some renderflags/effects on WoD 
When doing Draenei HD Female model to cata, i have made a mistake with some submesh
What happened ? Draenei face with a light inside her head 
http://puu.sh/dHZvX/6f9e982c11.png
the Renderflags was 0,4 i think
I saw the problem in a Draenei model, the renderflag was 7, I swtiched it to 4 and it was ok.