I spoke to an immigration agent and he told me that if I don't get my Permanent Resident Card on time, I could send an urgent request with a copy of the airplane ticket and then I should get it in about 3 weeks.
However, I just checked the immigration site and there is finally an update. They received my request on September 21st and started processing it on November 5th, so if all goes well, I should probably have by the end of December. Or if I have the same "luck" as with everything else taking so long, I may have to submit an urgent request...
Now I'm waiting to hear some news from my citizenship application. Hopefully not later than the end of 2012 (which will be 2 years less a moth since I passed the test)!