Remember to check out the free "Insane Night" map pack if you somehow missed it last week ... oh yeah, and don't forget to check out the game if you've somehow missed out on that, too.
Update: Seems worth mentioning that the UK allegedly (and accidentally) has this up on the Xbox Marketplace already.
Update 2: It appears that Europe will receive the DLC on both consoles, while North America will only have it on PS3. There is no word about when the pack will arrive on the North American Xbox Marketplace. Yeah ... we don't understand it either.