WASHINGTON (CNN) -- Al Qaeda leader Osama bin Laden is about to appear in a new video, according to a banner ad posted by al Qaeda's media production company, As Sahab.

"Soon, God willing, video message by the Lion Sheik Osama bin laden, may God protect him," the ad says in Arabic script translated by CNN's senior editor for Arab affairs Octavia Nasr.

The terrorist watch group IntelCenter said it expected the video to be released within 72 hours.

It would come just days before the sixth anniversary of the 9/11 terrorist attacks -- planned and executed by al Qaeda.

A U.S. intelligence official said the intelligence community is waiting to see if a video is, in fact, released.

"The most telling feature is if it is recent," said the official. The content could "say a lot about his situation, his health."