I (and, really, most people) never received that second AOR. I don't really know what is up with that, as it's supposed to go out once your application is deemed complete. On the other hand, many people report getting the BOWP with just the first AOR.
I am on implied status now, and will be until I land next Friday. As my partner has one more year of his current degree left, I applied back in June to renew my current open work permit, and he applied to renew his student visa, just in case our PR application was denied. He got the student visa a few weeks ago, but when I called to enquire about the status of the work permit, CIC told me they are backed up on open work permits and I wouldn't hear until mid-October. That's fine with me - once I land, I will withdraw my application and I hope I get my $255 back! My point is that the application will put you on implied status when your current visa runs out, and you very well may have a decision on your PR before you even get the BOWP! Good luck for a speedy decision on your PR!