nothing is 100% until you get a final letter. I have sent my medicals and PCC for over 2 months now and havent heard anything.
GOOD LUCK
Nothing is 100% sure until the visa officer at the POE signs your COPR, looks at you, smiles and says "Welcome to Canada". After that point you can truly say that you have arrived... That very moment in time is truly a life changing experience... So go ahead, feel free to run as fast as you can through the terminal with your baggages in tow to catch you connecting flight... it is so good to be free.