Still waiting for Canon to update their SDK. Phase One can't do squat about it until then.
Canon makes two SDKs, one for themselves (primary) and one for third parties. They've updated their primary SDK with 10.8 compatibility, but their most recent update to the third party SDK still does not support 10.8.
I'd suggest contacting Canon to log your disappointment that they have not provided third party vendors an updated SDK.
Look halfway down this page though for the unofficial and not officially supported workaround:http://forum.phaseone.com/En/viewtopic.php?f=40&t=12926