I had my interview last week and here's the summary:
Interview was at US land border crossing. Very few people but it took about 15 mins per applicant. I reached VERY early expecting it to be empty and getting called early but people kept showing up and I finally ended up using my appointment time anyway. The CBP and CBSA officers were sitting side by side and one person at a time asked me questions. They were very very friendly and I felt absolutely comfortable; usually customs officials tend to be serious so this was a welcome change. The US official took fingerprints, checked my documents and asked me the standard questions like whether I've ever been arrested etc. I have a clean record and all documents so no problems there. The US officer asked me why I wanted the NEXUS card and I said I wanted to skip long lines and the officer proceeded to stress on the fact that I will be expected to inform the CBP of any significant changes in my status (address, visa, etc etc) and it was extremely important to do so. I replied in affirmative.
The CBSA officer also looked at my documents but only spoke about bringing goods into Canada and to declare ANYTHING that might be dutiable. The officer said that NEXUS members are required to know all the rules and regulations of bringing goods and "I didn't know that" doesn't work at borders and the membership can be revoked for any violations. He didn't ask me any questions at all. Nothing about my PR status or anything else. I felt it was more of an info session that an interview to be honest. They did not make me see any video as the video was playing on loop outside in the waiting room and I must have seen it a hundred times atleast. This center did not have a IRIS scan so I'll do it at an airport in the future.
Timeline:
Applied: Jan 16 2018
Condition approval: Feb 14 2018
Interview date: April 5 2018
Approval email: April 13 2018 (notice it took a week to get the email)
Awaiting card.