Several of the U.S. Citizenship and Immigration Services' (USCIS) documents and certificates have recently undergone design changes intended to help prevent fraud and tampering. Although the look of these immigration documents has changed, the application process and how applicants receive them has not changed.
The USCIS launched an enhanced Employment Authorization Document (EAD) on October 25, 2011, and a redesigned Certificate of Citizenship (Form N-560) on October 30, 2011. According to a USCIS press release, the changes incorporate technological improvements designed to strengthen security by reducing counterfeiting and tampering, and by facilitating fast and accurate authentication of the documents.
If you are using either of these documents, an experienced immigration attorney can answer your questions about the changes.