The Library of Congress has begun a "Bibliographic Framework Transition Initiative."
"A major focus of the initiative will be to determine a transition path for the MARC 21 exchange format in order to reap the benefits of newer technology while preserving a robust data exchange that has supported resource sharing and cataloging cost savings in recent decades."
"This work will be carried out in consultation with the format's formal partners -- Library and Archives Canada and the British Library -- and informal partners -- the Deutsche Nationalbibliothek and other national libraries, the agencies that provide library services and products, the many MARC user institutions, and the MARC advisory committees such as the MARBI committee of ALA, the Canadian Committee on MARC, and the BIC Bibliographic Standards Group in the UK."
This could make the RDA effort look like a piece of cake. How will the process be arranged to include these players?
Good luck, though. Sounds like fun to me. Let's get to work.
The press release has more information.