It looks like we have some confirmation, albeit unofficial, about what that mysterious countdown is on Led Zeppelin‘s Facebook page and Twitter account.  An unnamed source tells U.K. tabloid The Sun that the band is indeed planning to finally make its 2007 reunion concert at London’s O2 Arena available to fans.

The source reports that the show will be issued as a CD/DVD package and a Blu-ray disc “as part of a simultaneous global release” on November 22.  The source also says guitarist Jimmy Page is overseeing the project and “has been in the studio making sure everything is perfect.”

The countdown began on Saturday with the posting of the word “FIVE.”  The latest message, unveiled Tuesday, reads “II,” so we assume the official announcement will be revealed on Thursday.

Meanwhile, a new video clip debuted on Led Zeppelin’s YouTube channel on Tuesday that shows the four symbols featured on the group’s fourth studio album, and is accompanied by the opening riff of “Good Times Bad Times” and the sound of an audience cheering.

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