So, my wife has landed. I have the SA, AIP, and DM letters here from earlier this year. September 15 is an AIP letter. It sounds like an AIP + QA letter; a letter I have seen several times, via friends and members since the beginning of this year.
Funny story: look at the timelines for 2016 in the spreadsheet. A person who applied the same day (received) got an SA and AIP before my wife (a week or so). They got a transfer letter, just after our SA, and waited 8 weeks. They had to wait for a QA interview at Etobicoke. My wife, landed without anything other than a redo medical.
You don't have to believe me, ask
@matthars or
@sylvain1.
This will either end in a review and an approval, or a review and an interview (and approval from there).