The State Department's National Visa Center has recently received your approval form I600A, Application for Advance Processing of Orphan Petition. This letter is to inform you that your petition has been forwarded to the appropriate visa-issuing post where the adoption interview will take place.
Blah, blah, blah,
Bureau of Consular Affairs
What does it mean? I don't know. But hey, it's progress! We are expecting to hear something any day, so it's nice that we are, as my aunt Lorie used to say, getting our ducks in a row!