If SimpleSAMLphp is your WAYF connector, here is an option for you to fetch metadata comprising WAYF's new certificate.
New WAYF metadata corresponding to your particular version of SimpleSAMLphp (versions check) is available for download below (ZIP archive). The two current files are to be overwritten with the two files contained in the ZIP archive, on the 17th of April 2012 at 10 o'clock—but not any sooner than that time on that date!
Place the files in the metadata directory of your SimpleSAMLphp installation: