I think that's the cinematics group for all Blizzard games, not just WoW. From the article: "Machinima sequences, teasers, and the amazing pre-rendered cinemas that make Blizzard games kick off with a flash are all created in this group."
If it's across all Blizzard games that makes far more sense, but the context of the talk is WoW: "...Blizzard Entertainment's J. Allen Brack and Frank Pearce took the stage to offer a detailed look into the inner workings of the genre-dominating World of Warcraft."
