I did my landing last week at Vancouver CIC Office. They didn't cross out my old valid Canada visa and also didnt cross out PR visa. So I believe if you have a need to travel before receiving PR card, go to CIC Office. You may be able to travel and board a plane with existing valid visa.
Also, I gave my workplace address for PR card delivery as i will be changing my current residential address soon. I told this to immigration officer and he said its absolutely fine. They just need an address where Canada post can deliver post. Doesn't necessarily has to be home address.
Good luck all who are waiting.