CIRA has informed us that they will be sending an informational email about the changes to the Administrative contact for all .ca domain names on May 6th, 2008. You can read more about the specifics of the new CIRA WHOIS Policy at CIRA's web site - http://www.cira.ca/en/Whois/whois_intro.html
Points of note:
- Effective June 10th, 2008, the .ca public WHOIS will no longer provide personal information for individual domain name registrants.
- Registrant information for domains registered to corporations will still be provided.
This will be a welcome change and will help to prevent unscrupulous companies from using whois information to perpetrate domain hijacking and other scams on domain owners.