I have heard questions around these scenarios from several people lately:

• Adding reports and/or dashboards on an existing project that was created without these options
• Adding the new Agile/CMMI RC version of the reports to existing projects after upgrading from TFS 2008 to TFS 2010
  • We provision updated version of 2008 reports that works with the new warehouse and cube schema when the server is upgraded from TFS 2008 to TFS 2010. These instructions allow you to provision the latest version of the reports from 5.0 version of the templates to these projects and wire them up.
• Updating reports on existing project to latest version after upgrading TFS 2010 from Beta 2 to RC

The steps aren’t where we’d like it to be, but its far better than the manual workaround that involved creating a temporary project we had in Beta 2. It still requires updating each project individually and we are working on a powertool to make that easier for RTM.

My colleague, Gregg Boer, has posted the instructions on his blog: http://blogs.msdn.com/greggboer/archive/2010/02/24/creating-sharepoint-portals-reports-and-upgrading-reports-for-an-existing-team-project.aspx