Fans of the Fallout series were surprised that while Bethesda Softworks bought the rights to create the Fallout 3 single-player rights. Interplay, the former gaming powerhouse that has since fallen from power, retained some rights to create an MMO-based on the game franchise, in which it would pay Bethesda money to use its former licence.

On Thursday, Interplay announced a deal with Bulgaria-based Masthead Studios to develop a massively multiplayer online game that's code-named Project: V13. The press release says that the two companies have been working on the game since November 2007.

Masthead Studios, a relatively unknown developer, has been working on the stellar-looking MMO game called Earthrise and tools from that game's development will be used in the Interplay game.

"We are looking forward to turning the vision of our game designers into a compelling online gaming experience," Interplay Chairman and Chief Executive Officer Herve Caen said. "The planning and design completed for Project: V13 thus far, combined with Masthead's resources, tools, and growing team of dedicated MMOG developers, will bring this unique game to reality."
Earthfall and Fallout's similarities aren't all that different. Both depict post-apocalyptic nuclear events, screenshots of Earthfall do look like slightly different take on what players have experienced with Fallout 3, and both games have mutants. Earthfall does offer a major difference, characters store themselves in memory banks and can be uploaded into a new clone body if they die (just like the human Cylons in Battlestar Galactica).

While neither company is making any clear indications as to whether Masthead's Project: V13 will become Fallout MMO.