I would assume next week early at some point, yeah. What I've found over time is that we generally sit on the last update for maybe two weeks or so before the RC is released, and then there's been times where a 2nd RC is warranted and released later in the week after the Apple Event, like on a Thursday or Friday even sometimes. The RC should have all of the Logging and extra Developer/Beta stuff removed, and then time needs to pass with enough people using it to ensure there's no 'Gotcha' issues like Memory Leaks or something. Sometimes bugs aren't found right away because it might take days and days to happen.
But yeah, I'd say next Monday is a good bet.
The one caveat relates to when the new phones ship. If for some reason they shipped for arrival later than next Friday (9/16), we might not see the public release early next week. Not likely but certainly possible.
I do expect to see the public release on Monday/Tuesday next week subject to the above.
In any event, Tim Cook will tell us when it will drop during the iPhone keynote. So, by 3pm tomorrow, it will no longer be a mystery.