Oracle 12c is a different animal than 11g. New multi-tenancy features designed to better manage workloads across multiple servers introduce the concepts of containerization, and new methods of organization.
I ran an installation of CCC on Oracle 12c (126.96.36.199.0) running on Windows 2012. The installation worked just fine, but required the following changes to our installation procedure:
Note - this isn't a full set of test cases, but it does indicate that supporting Oracle 12c should not pose any major challenges.