From Diablo Wiki
Titan is the codename for a next-gen MMORPG under development at Blizzard Entertainment. Nothing is known about Titan's setting or game type, other than that it is an MMORPG, and that it's set in a new IP. Titan is not Diablo, Starcraft, Warcraft, or even The Lost Vikings; it has no direct connection to any other Blizzard gaming world.
Blizzard has said they're very unlikely to announce anything official about Titan until 2012.
 Codename: Titan
The codename of Titan was revealed in late 2010, thanks to a leaked internal company memo/product release chart. Prior to that it was known that Blizzard was developing a next-gen MMORPG, as they'd been posting jobs on the project as far back as 2007, but there was no name attached to the project.
 A New IP
Titan was confirmed to be a new IP (Intellectual Property) by WoW CM Zarhym, in a post from 2007.
This was repeated later in 2007 by WoW CM Drysc (who changed his name to Bashiok when he moved over to the Diablo III CM job) commented on the job postings:
During the company's Q2 2010 earnings call Activision Blizzard CEO Robert Kotick commented on the Titan project and confirmed it would be an entirely new IP.:
 Learning from WoW
 Titan's Setting
There have also been past job openings for the Titan team that mention Sci-Fi and Fantasy style artwork amongst the job requirements:
- Diablo.IncGamers.com news items about Titan
- www.titanwatch.net - Titan fan site and forums
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