On March 8, 2013, the United States Citizenship and Immigration Services released a new I-9 form that all employers must begin using by May 7, 2013, to document the employment eligibility of new hires. If you are reverifying the eligibility of a current employee because an eligibility document expired, or if you are rehiring a former employee, you must also use the new form for those purposes. Just as before, every new employee must provide you with documents that verify the employee’s identity and eligibility to work in the United States within the first 3 days of employment. Only the form on which that eligibility review is documented has changed.

Here is the link to the new form: https://www.uscis.gov/files/form/i-9.pdf. There is no reason to delay in beginning to use this form, so make sure whoever is in charge of your hiring is aware of the change to the form.