Blizzard Hiring For "Next Gen MMO"

Blizzard has posted several positions for a "Top Secret" Next Gen MMO. Job listings include Game Physics/Collision Programmer, Lead 3D Character Artist and Lead 3D Environment Artist. Diablo Online, StarCraft Online or Lost Vikings Online? Or could this be an as yet unnamed new intellectual property? I'm thinking it has something to do with the mysterious Hydra Project.