Alright, guys! Finished our (me & my wife) interviews today and it turned out to be a very smooth affair.
I reached there 15 minutes before the scheduled time. After security clearance, you have to turn right and go up the stairs and go to room 219 for the interview. Just drop your appointment letter at Window #2. You can't see through the glass, but a mysterious person will pick up the letter from other side. It is a big enough hall with small play area for kids as well, so it is perfectly OK to take your kids as well.
5 minutes after my scheduled time, Ms. Julia called me and took me to her office. She asked for my green card and CA ID. After that, she took my oath and had me say that whatever I say is true and nothing but true!
She started going through my N-400 and checked if everything is still accurate. I had change of address (AR-11) and 3 India trips after I had filed N-400, so she noted all very patiently.
Then, she made me write an English sentence in cursive and also made me write my name in cursive. She also gave me a print out with 10 questions. I got all of them right. They were among standard 96 questions.
Finally, she told me that my oath would be on Aug 22nd. I requested if it can be set up for July since I need to travel for business. She told me that there is an oath ceremony in USCIS office on July 27th and she will include me for that ceremony. She also offered to do the same for my wife (her case was also with the same officer). So, both of us are scheduled for July 27th. No letter yet, but she told me that they'll send me the letter shortly.
In brief, it is a very smooth affair and nothing to sweat over.
Good luck to you all!