From the Federal Depository Library Program Web Site:
Library Services and Content Management is updating the U.S. Government Printing Office (GPO) Cataloging Guidelines to better reflect current cataloging practices and standards. Last updated in 2004, the GPO Cataloging Guidelines codify the procedures and practices used by GPO to catalog government information materials.
The Cataloging Guidelines update is being done in phases.
Phase 1 involves issuing instructions related to name authorities, subject cataloging, and non-MARC metadata schemes used by GPO.
Phase 1 is now complete and available on beta.fdlp.gov.
Phases 2 and 3 will focus on revising and completing all remaining sections of the Guidelines and determining a schedule for future updates to the Guidelines. Phases 2 and 3 are scheduled to be completed in 2014.
Direct to U.S. Government Printing Office Cataloging Guidelines