The first COD BO DLC has just been confirmed. It will have 4 MP maps and 1 zombie map. More info at this link: http://www.iplaycod.com/forums/26-cod-news/6679-black-ops-dlc-map-pack-first-strike-2-1-2011-a.cod#post112854
Unfortunately us PS3 owners have to wait for the DLC to come out for us because the 360 is getting it first.
Update: If you want ot see a map overview on the discovery map and a little info about go to this link: http://www.iplaycod.com/forums/95-black-ops-maps/6705-black-ops-map-discovery.cod#post113099
Commenting has been stopped - Due to the stupid amount of arguments and flaming. Soviet Salmon's post below was the straw which broke the camel's back.17:38, December 23, 2010 (UTC)