The new regulations apply to spouses or partners in a relationship of two years or less and who have no children in common with their sponsor at the time they submit their sponsorship application. The spouse or partner must live in a legitimate relationship with their sponsor for two years from the day on which they receive their permanent resident status in Canada. The status of the sponsored spouse or partner may be revoked if they do not remain in the relationship.
http://www.cic.gc.ca/english/department/media/releases/2012/2012-10-26.asp
とあるので、「申請書の提出時」に2年以下の関係の子供のいないカップルに適用ですね。PR取得時ではありません。