No its not true. Google is working with Sony to make a Xperia Z type of Nexus device BUT that is just rumors for now. There is no information leading that the Xperia Z will come to Rogers or any Canadian carrier.
EDIT - . I did search online & some asked a few Sony store reps at the Eatons Center & they claimed its coming June & August. Even they do not even know, Nothing is true until Sony or Rogers says something. Until then, no one knows.