REPLIES 
i meant reply to my comment :O
Murlocs, live on the mountains, and riding on gryphons.
Gorlocs, live in Ironforge and known for their blacksmithing abilities.
The Scourge, controlled by the betrayor troll Barthas who killed his mother.
About the High Elves/Blood Elves, I think it's more funny to give their role to the Furbolgs (High Furbolgs and Blood Furbolgs). The Elves will get the role of the murlocs.
The Worgen have already a role, which given to them by Blizzard.
i'd modify dwarves as : sky-based floating cities, tops of mountains if needed
draenei - all ensalved as warlocks succubi/inccubi
goblins - cross bred with trolls to make super tall creatures who are all british-like(growth based on the same genetical proces as ligers)
forsaken - hipohondric extra pedantic and sterile areas such as hospitals.
Worgen - instead of being infected by lycantrophy, they were infected by something different. Now, every midnight, they turn into giant pink bunnies.
No, worgens would be Peacful worgs who turn into the savage humans at midnight.
Barthas is ruling his democratic desert of Sandtiara, in southern Northrend.
REPLY
Dirk399
ok, since all the races are reversed:
orcs, they love litterature and have a society without violence
humans, live in packs, have no brain at all and eat anything they get across (kinda like americans)
gnomes, focus on nature and are tree-huggers living without any technology.
i will try to predict all the other races:
dwarves, protects nature at all costs, but have no interest in history whatsoever
night elves, destroyers of anything green, and kills anything in their path
draenei, not there since the spaceship from outer space actually WORKED
blood elf, protectors of the arcane magic, sworn to protect the arcane and not use it for selfishness. eventually they never became addicted to magic and still remain as high-elves.
tauren, hyper-tech and similiar to gnomes.
troll, extreme focus on litterature, speech and cannot stand anything not civilized.
undead, allied with arthas, never broke out of the scourge, or never became undead in the first place.
Goblins, lives freely searching for adventure, but will not take anything for any favours they do.
Worgen, i really have no idea :/
anyone with additional races may comment their ideas below :)