"USCIS recently published revised Forms I-90, Application to Replace Permanent Resident Card, and I-601, Application for Waiver of Grounds of Inadmissibility.
The revised Form I-90 is labeled with a Dec. 17, 2012, edition date. The revised Form I-601 is labeled with a Dec. 16, 2012, edition date. Both forms are now available for use and can be downloaded from the USCIS forms website.
Previous editions of Forms I-90 and I-601 dated before Dec. 17, 2012, and Dec. 16, 2012, respectively, will only be accepted until April 16, 2013 – 90 calendar days after publication of the revised forms. After April 16, 2013, we will only accept the Dec. 17, 2012, edition for Form I-90 and the Dec. 16, 2012, edition for Form I-601.
Downloading the revised forms from the USCIS website is recommended for improved intake and processing. Using the latest editions of these forms facilitates optimal character recognition for data capture and prompts the customer to fill out the form completely.
Details on who may file Forms I-90 and I-601, and on what grounds are provided in the form’s instructions." - USCIS, Jan. 22, 2013.