USCIS published an updated edition of Form N-300, Application to File Declaration of Intention. The new edition is dated 03/30/16. Starting 7/15/16, USCIS will only accept the 03/30/16 edition. Until then, you can use the 03/21/13 edition.
Finally after a very long wait, we had our interviews yesterday at the USCIS Seattle office. The interview and tests went well and the officer let us know that she was approving our citizenship cases and asked whether we would like to attend our oath ceremony the same day. We attended the oath ceremony at 1:00 PM yesterday and received our citizenship certificates. So to answer your question, yes the Seattle office has same day oath ceremonies all 4 week days except Fridays (I asked).
I just passed my interview .
3/11/2016: N-400 Mailed. (Friday)
3/14/2016: N-400 received as per FedEx. (Monday at 10:30am)
4/1/2016: Finger Printing Notice Received. (18 days after they received).
4/12/2016: Finger Printing Done (29 days after they received package).
4/18/2016: Got letter with the interview date (6 days after finger printing, 35 days after they receiving package)
5/23/2016: Interview date
5/23/2016: Interview done. And I was approved