In essence, it ensures that only those who are eligible for the exemption get to claim it. It furthermore ensures that reporting of sales of primary residences will from now on be made in all circumstances, whereas before it was only under the circumstance in which tax was owed. Now all sales of principal residences will be reported to the CRA. In addition, the CRA was provided with the power to audit on a permanent basis the past transactions in houses to ensure there was no tax avoidance or evasion. In all, we reinforced the powers of the CRA both in rules and in terms of their audit function.
On February 13th, 2017. See this statement in context.