I had my interview on Wednesday at the San Antonio office. It was scheduled for 2:30 and they ran about 30 minutes behind. The IO was very personable although he had a heavy accent that it made it difficult to understand him at times. I sat first then he had me stand to do the oath. He reviewed my file, asked me to sign my name 5 times for practice, went through the Eng and Civics test and wrapped things up. I was with him for about 30 minutes.
A couple of notes:
a) Be sure to bring an extra set of 2 normal, passport style photos (not the ones with the ear shot). I had to get an extra set at the photo shop next to the Valero next to INS.
b) Triple check the form you are given at the end of the interview. Mine was incorrect - the IO had marked that my app was incomplete and that I was recommended for Citizenship. I asked him about it and he acknowledged the error and printed a new, accurate page. I'm glad I asked.
c) My IO asked 10 questions regardless if you got first 6 right..."what is freedom of religion", "what is the name of first 10 ammendments to Constitution", "what are 2 parts of US Congress", ""# of US Senators", "# of voting representatives in the house", "name a state that borders Canada", "when must all men register for selective services", "when was constitution written", "who wrote declaration of independence", "why are there 13 stripes on the flag"
d) I didn't even touch the 4-inch file of papers/copies that I brought to the interview...that felt like a waste of time.
e) IO said you should receive a letter 2 weeks after interview. The oath session for SA is tentatively scheduled for March 19th. They run monthly. Apparently the Austin sessions are 1x/year now..
Updated timeline:
Dec 3, 2009 - Sent N-400 via courier
Dec 8, 2009 - INS issued confirmation receipt
Dec 9, 2009 - INS Cashed check
Dec 24, 2009 - INS sent FB notice
Jan 5, 2010 - Yellow letter to bring license to interview
Jan 11, 2010 - Completed Biometrics/FB (was in and out in 30 minutes!)
Jan 14, 2010 - Received Interview appointment
Feb 24, 2010 - Interview - Passed!