Only just caught up with this but the PRISM 2.0 draft is now available (since July 12) for public comment. See this posted by Dianne Kennedy:

"Just a note to let you know that PRISM 2.0 has just been posted at www.prismstandard.org <http://www.prismstandard.org/> . This is the first major revision to PRISM. We have incorporated new elements to support online content and have expanded and revised our controlled vocabularies. In addition we have added a profile to support PRISM in an XMP environment.

We invite you to review the new specification (in 6 documents organized by namespace) and provide your comments before September 15. Please just email comments and questions to me, dkennedy@idealliance.org. "