Performance Point Server 2007 functionality will now included as part of SharePoint Server 2007 Enterprise CAL's. After Mid 2009, Microsoft will no longer provide support for the stand alone product. The BI functionality will be provided using MOSS, SQL & Excel.
Read more here:
http://blogs.msdn.com/sharepoint/archive/2009/01/23/microsoft-business-intelligence-strategy-update-and-sharepoint.aspx