Tribal Belly dance: it's origins, it's evolution and it's future...?

Is there also Canadian tribal bellydance style?

One of the troupes is "Belly belly hip" mostly inspired by American Tribal Style.Some Montrealers are developing their own tribal style. There is a dance troup called Ethereal Tribal and they perform with live music, which is already more close to the roots of real tribal dance style.

Will Canada develop its own unique branch of Tribal style or will they simply copy [ATS]?

At the moment there is more connection to American tribal style than there is a specific Canadian variant. The movement started in the United States and spread out to Europe, Australia and Canada as well. But Canada is moving fast to develop its own variation!