Bethesda has posted a short teaser video on social media service Vine.
The teaser shows shots of barbed wire, followed by a spinning 33 1/3 LP by The Moonlight Trio and George Shackley. Flashes of Johann Sebastian Bach and Air on the G String can later be seen.
While Johann Sebastian Bach was featured in Fallout 3's soundtrack, speculation that Bethesda was teasing Fallout 4 was promptly shot down by Bethesda VP of marketing and PR Pete Hines on Twitter. The latest rumours suggest Fallout 4 will reportedly be set in Boston.
Last week Bethesda promised to make "considerably more noise" in 2013 as a publisher.
Other Bethesda projects rumoured to be in development are ZeniMax Sweden's "Project Tungsten," with previous speculation pegging the game as a new entry in the Wolfenstein series. Earlier this year Wolfenstein popped up on the quickly-edited resume of composer Julian Beeston, with a release date of 2013. Beeston marked the game as in development at MachineGames, which was purchased by ZeniMax in 2011 to become ZeniMax Sweden.
MachineGames was founded in 2009 by former members of Starbreeze Studio, developers of The Darkness and The Chronicles of Riddick. ZeniMax has said the team is working on a title using id Software's id Tech 5 engine.
The teaser could also potentially be for Project Zwei, the survival horror game in development by Resident Evil designer Shinji Mikami that Bethesda is publishing.