Earlier today, my boss scheduled an employees only meeting today for 4 pm with no additional comments. When this happens, it's really one of a handful of things - reorg, reassignment of some management, or acquisition/merger.

In this case, it was reassignment of my manager to a new job. No new manager yet. And as lead, I officially knew this information earlier today. As a person who has friends in low places, I actually knew yesterday. =)