Please be Zwei...
It's not Fallout according to Bethesda's head of marketing: https://twitter.com/DCDeacon/status/324192731721265153
It features Johann Sebastian Bach music, has a vinyl from the 1930's/1940's, and has barbed wire.
MachineGames is believed to be a new Wolfenstein game.
Originally Posted by Polygon
A new entry in id Software's Wolfenstein series may be in development at Machinegames, according to according to a report from PlayNews and several online resumes.
A Google Cache version of composer Julian Beeston's official website lists his work as "ADR Engineer, Production Sound" on a Wolfenstein project in development at Machinegames. Beeston has also worked on Dragon's Dogma and Kinect Star Wars, according to his website and IMDB.
ZeniMax Media, the parent company of Wolfenstein 3D developer id Software, acquired Machinegames in 2010. According to the press release announcing the acquisition, the developer was already "working on an unannounced project for ZeniMax publishing subsidiary, Bethesda Softworks, that is being built on id Software's revolutionary id Tech 5 engine technology."
ZeniMax registered the wolfenstein.com domain in 2012, according to a Network Solutions whois search.
a new teaser: