Curious George

Condi says that the Aug 6 PDB was unusual in that it was a response to a specific request from Bush for background on al-Qaeda.

I wonder why he made that request when he did? Was it because of the general increase in ominous terrorist chatter over the summer? Or did they have more clues than they've told us about? Without the context of all the other PDBs it's hard to tell, but we can always insinuate.