Wolvar & Goblin Priests!!!

[Sylvermoon]

I can only imagine it being Wolvar, as there are actually examples of nice wolvar (remember how you capture their pups so that they can be raised peacefully by the Tuskarr in Dragonblight?) while Worgen on the other hand are 100% bad guys, all the way through. We also killed the cause of the existence of Worgen some time around level 24, so why would they make a comeback now? -_^

[Nimoku]

I can only imagine it being Wolvar, as there are actually examples of nice wolvar (remember how you capture their pups so that they can be raised peacefully by the Tuskarr in Dragonblight?) while Worgen on the other hand are 100% bad guys, all the way through. We also killed the cause of the existence of Worgen some time around level 24, so why would they make a comeback now? -_^

Killed the Existence I guess you never leveled in Grizzly Hilsl, Amirite?
Worgen are from another dimension. Arugal experimented with humans and worgen, inflicting a curse on the people of Pyrewood Village, them becoming worgen at night. what if Arugal continued his experiments and created a perfect Worgen/human hybird that stays in it's worgen like form all the time, have the strength and agility of a worgen, but have the mind of a human (only a bit more savage) for his little army that he controls. due recent events, like the Grizzly hills stuff, Arugal powers have been weakened and thus the people of some sort of human kingdom (prolly gilneas) that are perfect human/worgen hybirds (humans transformed in worgen-like creatures) regain their free will.

If we take everything as you just said, then Undead wouldn't be a playable race because the undeads are 100% bad guys and that their existance would be erased when we kill the Lich king? Because Arthas got weakened at some point, his control over Sylvanas and several other Undead (now the Forsaken) faded. This might be exactly the same as the Humans transformed into human/worgen hybirds (prolly from Gilneas.

Why Gilneas? the Human Kingdom of Gilneas has been isolated from the world when the undead plague was spreading, they build the Greymane Wall to keep the plague outside.
As far as we know, Arugal is a mage and could very well just teleport to the isolated kingdom, transform all the people into his perfect Human/worgen hybird species for his own little army ... and later lose control of them, so these worgen regain their free will.