PS: I know this is off topic, but please, PLEASE, stop regarding V13 as THE "fallout mmorpg" until Chris or anyone in gamesas confirms it is!
1. gamesas licensed the rights to a Fallout MMORPG from Bethesda when they sold the fanchise.
2. They announced that "management is working to secure funding for the development of a Massively Multiplayer Online Game (MMOG) based on the popular "Fallout?" franchise"
3. They MUST begin development by April 2009 or they'll lose the Fallout Online license. How much sense would starting another MMORPG now make?
4. They rehired at least two of the original developers of Fallout.
5. They list "Familiarity with the Fallout? universe." as a job requirement in their Careers section.
Of course, if they don't make the financial requirements by April, they will lose the Fallout license to Bethesda, which might be why they haven't officially announced it as Fallout yet (or maybe Bethesda is somehow blocking it), as they might want to keep it unknown until April and then when it's finally certain either announce it or rebrand it as a new setting.
Chris and Jason cannot of course officially confirm it, since they're under NDA, but it's pretty clear that unless Bethesda pulls the license from them, it is and will be developed as a Fallout MMORPG. The Vault - Fallout Wiki * Fallout Online * Fallout IRC Channel * Fallout: New Vegas