According to the Associated Press today:

   BERLIN - Experts have discovered a previously unknown work by
   Johann Sebastian Bach in documents taken from a German library
   shortly before it was heavily damaged by fire, researchers said
   Wednesday.

   It was believed to be the first new Bach work to surface in 30
   years.

   Researcher Michael Maul found the aria, dated October 1713, in
   May in the eastern city of Weimar, the Bach Archiv foundation
   said on its Web site.

   There was no doubt about the authenticity of the handwritten,
   two-page score, the Leipzig-based foundation said.

   Maul said it was the first Bach work to come to light since 1975,
   when a copy of the "Goldberg Variations" in a private collection
   was found to contain extra canons for piano in the composer's
   own handwriting. The last previously unknown vocal work by Bach
   to surface was in 1935, when the single-movement cantata fragment
   "Bekennen will ich seinen Namen" was discovered, the foundation
   said.  ...

You can read the complete article and see a picture of the score at:

    http://www.msnbc.msn.com/id/8143446/

Dave
http://www.classical.net/