It is expected that by January 2008 the ISO TC46 SC9 vote on the ISMN Draft International Standard (DIS) will have approved positive and the revised Standard will have been published both in English and French. 
One of the most important features of the new version of the Standard is the transition from 10 to 13 digits. In practical terms it means that the initial "M" will be replaced by 979-0 while the check digit will remain unchanged.