That's right, PDC was originally scheduled for Oct. 25th in Los Angeles (LA) has been cancelled and is in the process of being re-scheduled. To find out more info on the situation, go check out the PDC site:
We are currently in the process of rescheduling this fall’s Professional Developer Conference. As the PDC is the definitive developer event focused on the future of the Microsoft platform, we try to align it to be in front of major platform milestones. By this fall, however, upcoming platform technologies including Windows Server 2008, SQL Server codenamed “Katmai,” Visual Studio codenamed “Orcas” and Silverlight will already be in developers’ hands and approaching launch, which is where we’ll focus our developer engagement in the near term. We will update this site when we have a new date for the PDC that is better timed with the next wave of platform technologies.