What Chris said (rephrased):
1. 11 and above is supported through the ORA driver (PBORA126.DLL). Selecting 11 in the package will include that for support of 11 and beyond.
2. PB 12.6 still only supports 11g features. I found only partial success trying to use any of the new 12c features I found interesting to work with it:
- implicit result sets
- 32K VARCHAR2 columns
- identity columns