nope The $15 Call of Duty: Modern Warfare 2 Stimulus Map Pack, which broke a few Xbox Live DLC sales records, was originally planned for the June quarter, but was released early. One might speculate that the DLC was pushed up due to the then impending legal drama between publisher Activision and developer Infinity Ward.
World of Warcraft sales beating expectations is good news for Blizzard as new subscriptions have been slowing for the company's insanely popular MMORPG.
A second map pack for Call of Duty: Modern Warfare 2 is being developed by (those left at) Infinity Ward. The first map pack is currently available on the Xbox 360, but will be released on the PC and PlayStation 3 in May.