The list of new HD channels keeps growing.
Slice HD (673) link
Family HD (760) link
Investigation Discovery Canada HD (735) link
MovieTime HD (736) link
MuchMusic HD (667) link
Nat Geo Wild (Canada) HD (718) link
Not sure if I believe any of this until I see it.
I also read in another forum these HD channel additions are region dependent so while greater Montreal may get them other areas may not.