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.
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