Khalid Shaikh Mohammed is talking

It looks like the "coercion" or "torture" (call it what you will) of Khalid Shaikh Mohammed is paying off. He's offered new details about the planning of the 9/11 attacks during interrogations with American intelligence agents. It turns out that the initial plan for the attack, if this report from the AP is to be believed, was much more ambitious than what actually transpired on that day. The details outlined by Mohammed also suggest that the 9/11 plot evolved directly from the never-realized Project Bojinka.

Nonetheless, what I find most interesting is this excerpt from the story:

A key event in the plot, Mohammed told his interrogators, was a meeting in Kuala Lumpur, Malaysia, in January 2000, that included al-Mihdhar, al-Hazmi and other al-Qaeda operatives. The CIA learned of the meeting beforehand and had it monitored by Malaysian security, but it did not realize the significance of the two eventual hijackers until just before the attacks.

Three questions:

1. If the January 2000 meeting was so crucial, and the CIA monitored it, what exactly was gleaned from the meeting?

2. Why wasn't the "significance" of the plan or the two hijackers realized until much later?

3. And what's up with this realization occurring "just before" the attacks?! Is that a slip up by the AP reporter(s), or has this foreknowledge been suppressed, as many suspect?