I wouldn't count on the Shaw Media channels launching on May 29th. If you look back in this thread, there is a tentative list of HD channels that are being added and it doesn't include any additional Shaw Media channels.
Also just so everyone is aware, I believe May 29th, Shaw is just adding the LPIF channels and possibly some HD locals to come into compliance with a CRTC ruling regarding carriage of the LPIF signals. They have to be available by June 30th. The specialty channels probably wont start becoming available until well into June.