Developer Interplay had plans to release the MMO Fallout Online but a lawsuit with Bethesda halted progress. It was thought the lawsuit had been settled by now but according to recent court documents it is still ongoing.
Bethesda claims they own all Fallout IP rights while Interplay only has rights over the Fallout trademark. So series staples including weapons and game concepts are off limits, leaving Interplay with very little to work with for a Fallout MMO.
Games lawyer Jas Purewal says Bethesda could go on to block the release of Fallout Online or even have it transferred to their ownership.
Just a few months ago Interplay revealed plans to launch Fallout Online in 2012. At this point the state of the post-apocalyptic MMO is up in the air.