The USCIS has delayed implementation of a new I-9 form containing new employment eligibility documentation requirements. The January 30, 2009 announcement is here. Under the current schedule, a new I-9 form will be required on April 3, 2009. The Jan. 30 order extends the comment period for proposed regulations issued in November 2008.
You can see the new proposed regulations and the sample new I-9 form and instructions here.