On February 10, 2012, the U.S. Patent and Trademark Office published proposed regulations for the new Post-Grant Review Procedure, which takes effect on September 16, 2012, although the first Post-Grant Review cannot occur until a patent issues on an application filed on or after March 16, 2013.  These proposed regulations can be found at Federal Register Volume 77, Number 28: http://www.gpo.gov/fdsys/pkg/FR-2012-02-10/html/2012-2529.htm.