Fallout Battlecry was just announced as an MMO from Bethisdas new Battlecry studio. i can not post links due to my being on a console.
Its not a Fallout MMO, its a new F2P MMO called Battlecry from the makers of Fallout: Bethesda's Newest Game Is Like Team Fortress Without Guns You'll probably want the mods to change the title for you.