Today the Library of Congress announced the availability of new BIBFRAME 2.0 components for converting BIBFRAME data to MARC.  These include BIBFRAME 2.0 to MARC Specifications and BIBFRAME to MARC Conversion Programs, both written by Index Data under the direction of the Library’s Network Development and MARC Standards Office. 

http://www.loc.gov/bibframe/news/bibframe-to-marc-conversion.html