Check out What’s New in PerformancePoint Services and SP1? to see a list of the major features and updates included in SP1 for PPS.  Note that SP1 is an Office 2010 service pack, and it’s due at the end of this month.  Also check out PerformancePoint Scorecard Annotation Improvements in SharePoint Server 2010 SP1 and Naming Your PerformancePoint 2010 Database.

Update: PerformancePoint SP1 can now be downloaded here.  Also check out: Service Pack 1
for SharePoint 2010 Products is Now Available for Download and Office 2010 and SharePoint 2010 Service Pack 1 Availability.  Detailed description of the new cascading filters feature by Dan English is at PerformancePoint 2010 Cascading & Apply Filters – SP1 Features and another post is at Cascading Filters in PerformancePoint Services.  Dan also has an excellent PerformancePoint Services (PPS) Wish List.