As the day of lunching Oracle Apps R12 is getting closer I came across this document on metalink (404152.1) (Release Content Documents for E-Business Suite R12)
This document contains links to the published Release Content Documents for Oracle Applications, E-Business Suite Release 12. The RCD or Release Content Documentation communicates information about new or changed functionality in the specified release of the Oracle E-Business Suite. Existing functionality from prior point releases is not described. Use this document as a launchpad for R12 RCDs.
It includes info about all the Product Families on Oracle Application R12 so check it out.