I think they are keeping it close to their chest and saving it for the October surprise to hit Bush over the head with it a week before elections.
Timing is everything....as they say.
There wouldn't be enough time left for Bush to do anything about it before the election.
Kerry might ride into the election on that horse.
Anything related to Syria is far to esoteric to matter a whit to anyone dumb enough to be undecided at this point.
Nothing from here on in can be a bombshell or October Surprise other than some domestic pecadillo like Bush's DUI or something.