No matter how much butt you kick in World of Warcraft's PvP, you're never going to storm Ogrimmar with your Alliance character. Your Uruk-hai in Lord of the Rings Online is never going to bust out of the Ettenmoors to rampage through Rivendell's Last Homely House and slay Gandalf. You simply can't do it, my friend. Player vs. player combat in massively multiplayer online games tends to be carefully controlled and often shunted off into some sort of battlegrounds instance where it won't mess with the static world at large.

Warhammer Online is having none of that. Nowhere is off limits. Presumably, the forces of Order and Destruction can terrorize each other by capturing even the most distant starting area, shutting players out of their own cities. What's more, they can even capture, imprison, and Lynndie England each other's kings:

Q: Are you still planning to let us capture the enemy king? Which penalties apply to a faction without king? Which bonus for the winning side?

A: Once an enemies [sic] King has been defeated in battle, he will be sent to the invaders’ home city, where all who choose to mock and taunt the King will have their opportunity to do so.

Sadly, I'll probably never be uber enough (i.e. waste spend enough time) to take part in the game at this high a level. But I love reading about how this sort of thing is supposed to work. Mythic community coordinator James Nichols explains it here.

Thanks AndrewM and syncaine.