USCIS will actually will allow a grace period on old forms.

Message from AILA
Updated December 29, 2016:
After considerable pressure from AILA and other stakeholders, on December 29, 2016, USCIS announced that it will accept prior versions of forms that were revised on December 23, 2016, until February 21, 2017. The only exception to this grace period is the Form N-400, as USCIS announced the version change to that form on December 13, 2016 (AILA Doc. No. 16122930).