Congratulations.
Was your case first transfered to LA INS ?
My RFE response was received on Jan 7th and the case was transferred to SFO on Jan 10th. Since then I haven't heard anything from them.
As you said, they informed you 3 weeks in advance, I hope to get the interview letter soon.
Did they stamped your passports right away after the interview ?
Did he asked about your salary and current employer ?
Thanks.