Interplay has announced that it's bringing Bulgarian outfit Masthead Studios in on its "Project V13" MMO - the game that is so obviously Fallout Online.
Interplay will retain control of development, but will use Masthead's technology, tools and resources. Masthead is currently developing its own MMO, Earthrise.
Earthrise is, coincidentally, a science-fiction RPG set in a post-apocalyptic future wasteland. We saw it at GDC, so look out for our impressions soon.
Interplay sold the single-player rights to Fallout to Bethesda, resulting in the phenomenally successful Fallout 3 - but retained the rights to make online games in the series itself.