User blog comment:Crazy sam10/New Black Ops II game mode leaked/@comment-4373501-20130428205359/@comment-3150799-20130429112356

Doomsday could be (or at least be similar to) the scrapped MW2 gamemode Global Thermonuclear War. According to the wiki page about it, it was scrapped because it became a spamfest of explosives. This wouldn't be much of a problem in BO2 because of nerfed grenades (at least from launchers) and things like Trophy System and Flak Jacket.