Hi zeca,
If your e-mail says 'We are pleased to advise you that processing of your application has been completed. The Canada Immigration Centre in Montreal will contact you concerning your permanent resident status.', it's a good sign! It's a positive DM.
The next step is ..... just waiting again. Maybe, the Montreal office will send you a confirmation letter. If you receive it, you need to send it back soon with 2 photos for PR card. (Some people didn't get the confirmation letter.) And then, you will receive a letter about your landing interview.
You must bring the following documents at the interview:
1. Your valid passport and/or
2. The original of your identity document(s) provided to the CPC-V or to the local Canada Immigration Centre
3. All your immigration documents ---- OWP, study permit, visitor visa and so on.
4. Proof of 'undertaking' issued by MICC
5. CSQ
6. You have to be accompanied by your sponsor/spouse, your sponsor has to provide an ID document with picture.
7. SIN card beginning with 9 ---- If you have.
8. 2 photos ---- If you don't receive the confirmation letter and if you don't send 2 photos.
About 2, I don't know this. I just brought my passport and no problem.
I can't tell you when you receive these letters and when you have a landing interview. It might happen within one month after DM or it might take more.