On the contrary, it was anything but clear. In fact, it was intentionally ambiguous.
When it was apparent that all Siri references had been stripped from Apple.ca, Apple's response to the myriad of user and press inquiries was that "Siri would be included in iPhone 4s' shipped to Canada, but it was not advertised as a feature as it had not been localized for Canada".
When pushed for further clarification of exactly what this meant, none was given. Most people took this to mean that it had something to do with regional accents, or Quebec French etc. Even most trusted tech blogs and writers and at least one Apple employee in Cupertino, tweeted that Siri would work exactly as we saw in Forestall's demo for the majority of Canadians. It just might have some trouble with regional accents.
Clearly now, this is not the case and as The Globe & Mail pronounced, there is a "Canada-sized hole in Siri voice assistant".
This also leads to the question 'why Canada was excluded?' I can certainly understand The U.S., U.K., France etc getting it before Canada. Larger markets, denser populations. But Australia?? No offense to my several Aussie friends, but why was it launched in a country with less than 2/3 the population and market of Canada?