Hi varxx,
Thank you for asking. I was about to start writing about our interview experience as I arrived to home form USCIS office.
We arrived to the office around 9:30am (appointment times were: 10, 10:30,11am for my wife (winner), myself and my daughter, respectively). Of course, we had to wait ~1.5 hrs before our names were called by IO. He looks very nice and well dressed up too
Interview went for about 15 min. He first asked for your IDs? license, passports, I-20s etc.
He interviewed both me and my wife simultaneously. We went through most of the questions of I-485 for both of us. His strategy was just to confirm the dates/contents that we sent to them. Interestingly, he never asked us questions (except bunch of yes/no's enlisted in I-485) but stated like... "the birth date of you I have here is June 30, 1985, is this correct?" something like that. He was very nice and friendly!
He now shifted gears towards high school diploma things? He checked that in his file and confirmed that thats there. He did not asked originals.
Then, he asked our financial documents? He asked me that, do you have income that is higher than Fed. poverty guidelines? or do you have forms from sponsors? I said, I have annual income but not sure whether it is higher than poverty line cutoff. He asked me Tax returns doc for 2012. Based on that my income was slightly higher than that level. I handed that and He even did not ask me current employment letter. I did have I-134s (in case required) but he was satisfied with my annual income
After that, he said, we are approved
"the awaited moments". He also mentioned online system will be changed today at some point, also gave some ideas about not going >6 months out of US? GC will be forfeited if not returned US within 1yr, social security number applications etc.
Anyway, long story short: When I checked online status which has been "cannot find status" always for all of three have changed to Card/document production.
Thank you all who helped us in many ways for providing relevant information/suggestions/experiences/advise during this journey and Good Luck to all who are in waiting! Hope our experience will be helpful to waiting people.