If I'm not mistaken this is big news isn't it? Is this the first time this PDB has been released to the public?
Yes. The final 9/11 Commission Report is the first time the text of this PDB has been seen in public. Last weekend the Washington Post got a heads up on the content of the PDB:
http://www.washingtonpost.com/wp-dyn/articles/A58615-2004Jul17.html
Susan Schmidt of The Washington Post was read the text of the brief over the phone by an anonymous government official.A Bush White House official told the Post there is "no record or recollection of the new White House team having been briefed on that threat information."