Blizzard hiring for "unannounced game"

We know about Titan, we know about two more StarCraft II games, we know about two more World of Warcraft expansions, we even know about a Diablo III expansion - so what is this "Unannounced Game Title" Blizzard is hiring for?
The "Software Engineer, Tools" will be a part of Blizzard's "newest game team". "This is a key role on a new and exciting project within the company," the job description declares.
The "Unannounced Game Title" has a section of its own on the Blizzard jobs board. Titan, the "Next-Gen MMO", is listed separately, as are World of Warcarft, StarCraft II and Diablo III.
Could this "Unannounced Game Title" be a completely new IP?
An alleged internal Blizzard release schedule leaked last November, detailing all releases up 2015. We don't know whether its genuine, so take with a pinch of rock salt.
http://images.eurogamer.net/assets/a...d_leak.jpg.jpgThat schedule.




http://www.eurogamer.net/articles/20...announced-game