Not sure... I have all the '1st ed' Warcraft RPG books, but so far I've passed on the WoW RPG after taking a flip through it at the store. It's a massive book, priced accordingly, and as near as I can tell 90% of it is stuff I have in the PHB, stuff I have in the older Warcraft books, or stuff that's been changed for no purpose other than to cater to the computer game crowd. Then again, I invested in the original books because I loved Warcraft and wanted to bring some of it into my D&D game, not because I had the time to get a Warcraft game going. Take my brief rant with a grain of salt.
--Impeesa--