The calendar year of 2012 is a transition year for the NIEF Trust Fabric Signing Certificate. You can read the process we are following as we migrate to a new signing certificate in the NIEF Center Root Signing Certificate Transition Policy. The NIEF Trust Fabric will be signed with both certificates until February 2013, but as of August 2012 the longtime production URL at which the trust fabric was available for download will switch to being the signed with the new certificate. This specifically will impact any organizations using SAML software that automatically downloads, validates, and uses the NIEF Trust Fabric. Even if your organization is not using such software, I recommend being sure to update your local trust to the use the new NIEF Root Signing Certificate.