This doesn't seem to have attracted the same attention as previous decisions, but between Ontario, Quebec, and BC, 70% of Canadians live in a province where same sex marriage is now a fact. Somehow I doubt that this particular genie can be put back in the bottle. It would be absurd to have different marriage laws in the three largest provinces.
Proposed federal legislation is currently awaiting review by the Supreme Court, which is currently scheduled for October. (Text of questions and draft legislation.) This conveniently avoid embarassing the government during a spring election campaign, though l'affaire AdScam seems to filling that gap nicely.