On April 13, 2016, USCIS revised Form N-400, Application for Naturalization. The revised version is available at https://www.uscis.gov/n-400.
You may continue to use the 9/13/13 edition of the form until August 9, 2016. USCIS will reject and return previous versions of Form N-400 submitted on or after August 10, 2016.
You can watch uscitizenpod: THE NEW N-400 VIDEO or listen to uscitizenpod's podcast about the new N-400.
Also check out: Julie Pittman NEW 2016 Naturalization Practice Playlist
Also checkout: ILRC: Annotated N-400 and Translations in Spanish and Other Languages
This is an outstanding collection translations of the N-400 by the The Immigrant Legal Resource Center (ILRC) and its partners.