Some sites are "reporting" that Android 5 is coming at the end of November, others are saying sometime in December, and others are pushing it back to January/February. Your guess, at this point, is as good as anyone else's. So far websites are just spewing rumors without anything factual to back them up.
Just keep in mind that the roll out for Android 5 will be different for each carrier. Verizon releasing Android 5 for the S5 doesn't mean that at&t will come out with it at the same time.