Similar case
Hi Inforeq/Curious,
My case is similar to your case. NSC transferred my case to philly office (where I currently live) for faster processing. After 60 days without notice of interview, I called the 1-800 number of INS and requested an update on my case. They sent the request to philly office. After 30 days of not hearing back, I called again to follow-up. After a week, I got a letter indicating that I need to appear for an interview. I took updated employment letter (current employer), pay-stubs, drivers license, passport, documents verifying that I live in their jurisdiction (lease agreement, W2), original letters issued by INS (EAD Card, Advance Parole, etc)...I've made copies for all of them. I also took a letter of employment from the company that originally sponsored me saying that they have all the intentions of hiring me as soon as my GC got approved. Officer took all documents other than the employment letter from my original employer that sponsored me. He asked questions about my work, if i'm working in the same field (as per my labor cert), if i did send a change of address everytime I move, etc. After that, he took my fingerprint and stamped my passport.
Bottom line is, even if they would require you to appear for an interview, as long as you have all the documentation with you, there is no reason for them to deny your case as long as your I140 is approved. Don't worry, your case will be approved as well.
I am not a lawyer and my comments are based on my experience. Consult your lawyer so he could give you enough information prior to your interview.
Goodluck!
miguelerik