Another key factor is the current state of the beta; we're currently on an "a" build. From what I've
read/heard, that means Apple thinks it's extremely close to
done-done, if not already there. In theory, the only reason we would see another beta on Monday is if someone stumbles upon a real dealbreaker bug before the weekend is out.
Thus, if all goes well, the next drop should be the release candidate on Wednesday (9/2), and the final production release during or immediately following the September 9th event.