The following is an excerpt from the article at tracking terrorism (see post #2101 at the top of this page)...
"While not much information has been released as of now, we do know that a video tape containing a detailed description of the impending attack on America has been released."
The officials, speaking on condition of anonymity, described analysts’ concern as “low” because it was not clear that the tape was recorded recently and because the man on the tape, who spoke in what appeared to be an American accent, mentioned no details.
http://msnbc.msn.com/id/6345734/
Hopefully, more information to clarify the situation will appear.