When they sent me a message about my PPR, it had the following message:
This is in reference to your application for permanent residence in Canada as a member of the family class. We have now completed the initial assessment of your application, and expect to finalize your application without a personal interview. While an interview does not appear necessary at this time, we reserve the right to call you to an interview, should this become necessary at some future stage in processing.
So they reserve the right to still do one at any point still, but it itsn't likely.