Please share with anyone with a stake in PerformancePoint Server. The beta exam 71-556 (TS: Microsoft Office PerformancePoint Server 2007, Application Development) is open now through October 19 at Prometric. If you don't know much about betas, read this or this first.
The topics covered in this exam: no prep guide available yet
Configuring Business Roles and Process Management
Developing Business Rules
Building Excel Add-In Forms and Reports
Installing PerformancePoint Server