Just got my citizenship in Newark. Yes, interview and oath in NJ happen on the same day.
Priority Date: October 18, 2006.
Fingerprint Date: November 03, 2006
Interview Letter: April 02, 2007
Interview & Oath Date: June 05, 2007
Interview scheduled for: 10:20 am
Arrived on 15th floor at: 10:10 am
Invited into the room for an interview at: 11:15 am
Left the interview room (passed) at: 11:25 am
Was asked to sign the naturalization certificate at: 12:25 pm
(Was told that the oath ceremony will take place at 1 pm.)
Everyone was invited into the ceremony room at: 1:15 pm
Everyone left the oath ceremony room with a naturalization certificate: 1:45 pm
Interview: nothing special to report. Interviewer was very friendly and polite. Just a few simple questions based on the application (of the type: have you traveled outside the US for more than 6 months?), about 6-7 simple civics questions, asked to write one short sentence in English. Very easy.
The only things I was asked to show was my national passport and my green card (which they took away, of course). That’s probably because my application documentation was complete.
By the way - there really is no need to come in earlier. Clearly, everyone who came at least after 10 am ended up in the same oath "batch" at 1:15 pm. If you get hungry quickly - take a sandwich to eat it there.