From the USCIS Fact Sheet and Press Release:
"U.S. Citizenship and Immigration Services (USCIS) has proposed for the first time a standardized fee waiver form in an effort to provide relief for financially disadvantaged individuals seeking immigration benefits. USCIS has published a notice in the Federal Register seeking public comment on the proposed form – Form I-912, Request for Individual Fee Waiver.
The Form I-912 will be available for public comment at www.regulations.gov until September 13, 2010.