I read the media the same way as you have. I know that through its website, the United States government has attempted to address criticisms of the SPP. Similarly, the Canadian government website on the SPP attempts to address questions that have been raised. I know that on its website, the Mexican government has tried to ensure that its populace is informed of what's going in their SPP engagement.
On April 24th, 2007. See this statement in context.