[Nexus]

One more telling paragraph from the article:

Referred to in internal Pentagon messages as the "spring offensive," the operation would be driven by certain undisclosed events in Pakistan and across the region, sources said. A source familiar with details of the plan said this is "not like a contingency plan for North Korea, something that sits on a shelf. This planning is like planning for Iraq. They want this plan to be executable, now."

[Nexus]

by certain undisclosed events in Pakistan and across the region

Doesn't undisclosed mean they know and can't tell? This phrase gave me a bit of a chill.