From the article:
Speculation swirled recently regarding Blizzard's decision to trademark "Mists of Pandaria," as many thought it may indicate the name of the next World of Warcraft expansion. Pandaria, in Warcraft lore, refers to the home of the Pandaren, basically humanoid war pandas you may remember making an appearance as neutral heroes in Warcraft III. Chilton said the speculation was, "wildly overhyped." He added, "if you look at traditionally how we've handled that race it's been in those secondary products because we haven't realized it in the world. Most of the time when we do anything panda-related it's going to be a comic book or a figurine or something like that."