USCIS is informing all applicants that they should continue using the
currently available Form N-400, the Application for Naturalization,
until directed otherwise. The current form has an expiration date of
March 31, 2013. It should be used past this date, according to USCIS.
USCIS also notes the following additional acceptable editions of Form
N-400, with the following edition dates: 06/17/11, 01/18/11, 11/23/10,
04/05/10, 01/15/10 and 01/22/09 may also be accepted.