Since the adoption of CDB by Open Geospatial Consortium (OGC), the CDB 3.2 is now officially OGC CDB 1.0.
You can follow the Standard Working Group (SWG) activities
You will see that a number of topics have been identified for a 2.0 version. Some changes may target a minor release as well.
Is there a plan (date) for a CDB version 3.3 ? any new features to expect ?