Here is my interview experience. I had my naturalization interview this morning at 7:45 AM in LA. Reached the place around 7:20, it took 25 minutes to go through security & to room 2050. Gave my letter at the counter @ 7:45 and was asked to take a seat. I was called in at 8:10. The IO was nice but to the point and did not make any small talk. First I was asked to take the oath, then she asked me for my DL, GC & Passports. We started with the Civics test.
Civics Test
Q1. What is the name of the national anthem?
Q2. What is the voting age for presidential elections?
Q3. What it the "rule of the law" ?
Q4. What Ocean is on the West Coast of the United States?
Q5. What do the 13 stripes on the US flag represent?
Q6. What event happened on 9/11?
English Test
Read "Where is Washington D.C?"
Write " The capital of United States is Washington D.C."
She did not ask me for any other documents, she went through the N-400 pretty much line by line. She asked if I worked & paid my taxes. She checked my visits in & out of the country very intently although none of them were more than 1 month in duration. I had 12 trips in the last 5 years. She did not ask me any questions about them, it took a few minutes which I spent starting out of the window ;-)
The process was straight forward. It took around 10-15 minutes, she gave me the form N-652 with approval & told me it will take up to 90 days to get the letter for the oath ceremony, but it will probably be quicker. Then she photocopied all the pages from my current & expired passport, my DL & GC & wished me good luck
She did not ask me to sign the photographs.
Caveat for USCIS offices is that cameras are not allowed. I went here on the way to work & had my laptop,cellphone & kindle with me & forgot I always have a small camera in my bag (Doh!), but the security did not remove it.
Now to wait for the letter for the Oath ceremony.