Beginning Monday June 1, 2015, USCIS will only accept the new version of Form I-907, the Request for Premium Processing Service. This new version is dated 01/29/2015. This date is printed at the bottom of each page of the form. All requests submitted on previous versions of Form I-907 will be rejected on or after June 1.
USCIS issued this new version of Form I-907 on May 1, 2015. They continue to accept old versions of the form during the transition period, which ends on May 31, 2015.