New in the CS6 SDK, is the ExporterUtilitySuite, which supports a new "push-model" of operation. In older versions of CS (and still supported in CS6), all exporter plugins were required to use the "pull-model" of operation, where the plugin itself manually called Adobe's renderVideo function.
In the newly introduced push-model, your plugin registers a callback function with the exporterUtilitySuite. Then the Adobe application calls your plugin on demand (from a separate thread?).
The supplied exporterUtilitySuite API supports video-renders. But what about audio? Do exporter plugins still use the old pull-model for audio?
Yes, that is correct.