Final release from Microsoft.com download site is:
The purpose of PowerPivot for SharePoint is to allow users to share their PowerPivot workbooks in a secure and scalable environment. This whitepaper focuses on the features that SQL Server 2008 R2 provides to help IT users to manage and understand the self-service BI activity. This whitepaper also describes key features of the PowerPivot Management Dashboard that we provide with PowerPivot for SharePoint. The PowerPivot Management Dashboard is built using PowerPivot, SharePoint web part pages and Excel Services technologies. This white paper describes how IT users can extend the capabilities of the management dashboard by creating their own custom reports and dashboard.