My naturalization interview was just scheduled for end of November. A bit surprised since I only filed the N-400 in late August (and the I-751 in September last year), thought I'd go well into next year before hearing anything. Also, they didn't send an email about this update, but they did for all other updates (bio waived, change of jurisdiction, so on). So when I got the letter today I was ready to throw it out thinking it was just a copy of the jurisdiction update.