For many years it has been the policy with regard to temporary foreign workers that Canadian employers must attempt to employ Canadians first. When they are unable to locate Canadian workers, then they make an application for labour market opinion at HRSDC, who makes the decision as to whether or not the employer has made reasonable efforts to hire a Canadian first. There are no changes to those provisions envisaged.
On May 28th, 2012. See this statement in context.