It's a sad day for fake musicians everywhere: Activision Blizzard has announced that development of its Guitar Hero games The announcement came during a conference call to disclose fourth-quarter results. The company reported a profit of $418 million in 2010 and a net loss of $233 million for the quarter ended December 31, but it still reported record-setting performance for Call of Duty: Black Ops and World of Warcraft: Cataclysm.