Kyoto was based on the assumption that binding targets would work, without any method of enforcement. It did not predict the growth of emerging economies that the start of the decade heralded. Each year, countries reunite to continue the dialogue - this year it is currently being held in Durbin where discussions centre on how to save Kyoto.
So the leaked item of the day suggests that Canada will acknowledge its failings by withdrawing from the Kyoto agreement. Timely given the current conference, so is there truth to the rumour? Perhaps it is just a political trial balloon, gauge the reaction without doing a formal poll. If real, the action is a typical Harperism. Rather than continue to ignore Kyoto as is the tacit government policy, fly it in the face of the those that are willing to demand change. Canadian emission control efforts have been undermined throughout the conservative government years already.
PS - CBC coverage on Canada's waivering committment is commendable, worth checking out. http://www.cbc.ca/news/world/story/2011/11/28/pol-durban-conference.html