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
Beginning May 5, U.S. Citizenship and Immigration Services (USCIS) will accept only the current edition of Form N-400, Application for Naturalization, dated 9/13/2013. USCIS will reject and return all naturalization applications using previous versions of Form N-400 after Sunday, May 4, 2014. You can find the edition date at the bottom of any Form N-400 page.

U.S. Citizenship and Immigration Services (USCIS) has several new resources for citizenship instructors, volunteers, and program administrators in the Citizenship Resource Center.
On April 1, 2014, U.S. Citizenship and Immigration Services (USCIS) began accepting applications for a competitive grant funding opportunity to promote immigrant civic integration and prepare permanent residents for citizenship. USCIS will offer up to $10 million in competitive funding for citizenship preparation programs in communities across the country.