The OP asked about ODAC, which is distinct entity from ODP.NET. Managed ODP.NET is already production with the release of Oracle DB 12c. You can extract managed ODP.NET from the 12c client and install it. The ODAC 12c version of managed ODP.NET include additional bug fixes on top of the first ODP.NET 12c production release plus support for Oracle Developer Tools usage scenarios.
There will be no 11g production version of managed ODP.NET. Frankly, version number doesn't carry much functional significance. If there was an 11g production version, it would be functionally the same as the 12c version.