I looked at a few of the coming into force announcements at that site, and in each case the date was announced only a few days before the law went into effect! For example, this:
"Order fixing April 29, 2013, as the day on which sections 4 and 6, subsection 9(2) and sections 30, 47 and 78 of the PROTECTING CANADA'S IMMIGRATION SYSTEM ACT, chapter 17 of the Statutes of Canada, 2012, COME INTO FORCE."
was announced on April 25, 2013! There has to a better way of discovering the coming into force date than looking there. Hopefully, CIC will announce a more precise date before too long.