Old CBC HD (Official thread) 2005 to May 2006.
I just called Videotron (technical support) and they told me that Radio-Canada/CBC TV HD stations in Montreal will be available at no additional charge on their cable service, starting February 21.
Positions will be 602 for CBFT HD and the present 606 for CBCHD. I am not sure what will the exact identifier be for Radio-Canada.
Availability dates vary. For Montreal they told me it will be next Monday, February 21. For other regions it will be a week later, February 28.