Now that I passed the interview I can comment on this
You are going to receive your PR Card within 2 months. It's necessary to bring your passport but it stays with you after the interview (I don't know if there are different rules for people from other countries).
The officer will ask questions such as "have you been deported from Canada?" or "Have you committed any crimes in other countries?". The entire process is very simple and quick (they will confirm some information about you but it is just to check if your file is correct). You leave the office with your COPR and that's it.