The letter indicated that we were approved. It made no mention of an interview. It simply said bring the three pictures, ID, and all the prior paperwork. But clearly it said we were approved. In our submission of the I-751, we sent in a cover letter and a host of copies of documents ( house, utility bills, life insurance, joint med insurance, car insurance, etc) and two letters from friends attesting to our relationship. Of course different service centers and different local offices have different timelines. We were surprised that it was so quickly. Also when we went on line at the USCIS site and typed in the LIN number it came back as an error. So that option never appeared helpful. As some have mentioned the processing dates in the most recent NCS update showed processing of June 2005. So this is a little inaccurate because our submission date was in late July. Hope this helps.