From USCIS: Revised I-600 & I-600a Forms Now Available
From The United States Citizenship & Immigration Services:
We would like to inform you that a revised Form I-600, Petition to Classify Orphan as an Immediate Relative and Form I-600A, Application for Advance Processing of an Orphan Petition, are now available for use.
Applicants may begin using the revised forms today. Applicants may continue to use other previously accepted versions until March 23, 2015, at which point only the most current version will be accepted.
USCIS Public Engagement Division