Update: MMO Champion has more -- apparently there are also zombies appearing outside the major cities that will infect players with a plague (infected players get their own spells and can spread the plague to others), and the Argent Healers are there to try and stop it.
Update2: We just logged on to Cenarius US, and while the Argent Healers were there, there were no signs of zombies yet. Looks to us like the world event itself will go live at midnight server.
Scratch that -- it's on right now. More after the break.
6:33pm: MMO Champ claims there are crates in Booty Bay that can be looted to become a zombie. We're on our way down there right now.
6:38pm: Yes, there are crates in Booty Bay labeled "Conspicuous Crate" that will give you a 10 minute disease buff when clicked. We just clicked it, in the interests of science, and while the disease works its way through our system, we're... headed back to Stormwind. Die, Humans!
6:42pm: 5 minutes left...
6:46pm: 2 minutes left. I'm hanging out by the flight point in Stormwind -- apparently if you go anywhere near the healers, they'll cure you right away. Waiting to see what happens when the buff runs out.
6:48pm: Confirmed. After 10 minutes, the buff turns you in to a zombie, with your own abilities to mess around with. I infected a few people before the guards showed up to put in a beatdown, and a random Druid moonfired me out of existence.
But the war is on -- the crates in Booty Bay will deliver the plague to players, and from there, we'll see how long it takes to infect the whole server. Brilliant on the part of Blizzard -- stay tuned for more updates as we get them.
6:53pm: Confirmed on all servers -- there are crates in Booty Bay (delivered by Arthas himself?), and we've heard reports of infected pumpkins in Elwynn, so there are likely other points of infection elsewhere (thanks, Aigarius). Update: we've checked for pumpkins in Elwynn and haven't found any. Booty Bay has the only confirmed crates.
6:56pm: We're back in Booty Bay (just got another infection, since it was so fun the first time), and apparently NPCs can be infected as well -- there are Bruisers around with the green glow of infection on them.
7:00pm: Oh no! Just tried to walk out of Booty Bay and got cured! Blizzard has apparently set up healers in certain places to keep the plague from spreading places they don't want it to go. Zach Yonzon also notices that any NPCs killed by zombies become zombies themselves.
7:02pm: Answers to questions:
Q: If you die, do you come back as a non-zombie?
A: Yes.
Q: What's the debuff considered?
A: It says Disease, so we'd assume anyone who can cure disease can cure it as well. When you get the debuff, you glow green, but if you are killed by a zombie or an NPC zombie, you automatically become one.
