UPDATE: There are multiple confirmations, so it's very likely that the Darkmoon Rabbit is live as of 5.0.4. So far I've only heard of EU servers being graced with the rabbit's presence, but since the spawn rate seems random, we'll see later in the day about other regions.
I'm curious to find out if you have to be part of the raid group, with the person that tagged the Darkmoon Rabbit first, to be eligible to roll on the pet and receive credit for the achievement. On the beta, you don't have to be part of the raid or group to receive credit for killing a quest mob; you just have to do some damage to the mob. But I don't know if this applies to world bosses as well.
The Darkmoon Faire is back in town! But wait, wasn't there something new about the faire? Something with a vicious streak a mile wide, perhaps? ;)
I'm referring to the new level ?? raid boss, the Darkmoon Rabbit (who drops a pet of the same name), that spawns in the Darkmoon Island Cave. It's only accessible when the DMF is open. On the beta, it had 72 million health, but I've read new reports that it's been bumped up to 174 million.
The Darkmoon Rabbit has quite a nasty attack and puts a debuff on players, reducing all healing done to them by 100% and causes the loss of control over your character for the duration of the debuff.
Originally, it was possible to kill it with combat pets (example: hunter, mage and warlock pets), since the Darkmoon Rabbit couldn't put the debuff on minions. However, I heard that this was changed and now pets aren't as effective as before. I can't confirm this, though, so don't quote me on that lol.
Since this boss is such a fierce creature, it's a wonder how we'll kill it. Some speculate that Indalamar's New Holy Hand Grenade will be required, but there's no information on how or where this weapon comes from.
The biggest mystery, though, is whether or not this rabbit is live with Patch 5.0.4.
I just checked the cave on my server and found it empty. I plan on waiting around for a while to see if it shows up, but I have my doubts. Since this boss seems like a rarespawn, I might end up waiting a while before it shows up. Or it might really be NYI.
There were a few recent comments on Wowhead, one saying that the Darkmoon Rabbit is live, while the other said that it isn't. It's hard to tell who's trolling and who's being truthful.
I guess we're going to have to wait to find out whether or not the Darkmoon Rabbit is live or if we'll have to wait until MoP.