Could there be something far worse in the classified 28 pages than just involvement by the Saudi government?

Did the feds meet with the hijackers beforehand, hoping to take them down before any damage was done?  In other words: was this a sting gone horribly awry, a la OKC bombing?  Or even similar to the 1993 World Trade Center bombing, another FBI sting gone live?  My guess, unfortunately, is that nothing of value will be gleaned, which is why the National Security director seems fine with their release.