I went for N400 interview June 13 in Fort Myers FL and was approved except I-751 file was still sitting in Potomac. Interviewing officer said he had already requested file and I could expect a letter within a few days scheduling the oath ceremony. (It would have been same day if he had the I-751). I kept checking online status and could see the file was sent and oath ceremony was to be scheduled. Received a phone call exactly one week later on June 20 advising that oath ceremony was today, June 26. Also received letter in the mail confirming ceremony date and time. Everything went very smoothly this morning and I received my naturalization certificate.