Assuming the Pakistani report is true, the only way these Pakistani officials could learn so quickly that Zawahiri was still alive would be by talking to him personally. I believe there are those in the Pakastani government (not Musharraf) that are protecting al Qaeda with the full understanding that American forces are not allowed to hunt for them in Pakistan. At the very least, they will now know that the rules have changed.
About an hour ago, a network radio newscast (either Fox or ABC) stated that a Pakistan official said there was a "50-50" chance that Zawahiri was in that pile of rubble.
I'm gonna say he was until I hear different from my own government.