There are no discounts for arrivals past October 2nd at this point, with the exception of DC and AAA, which by this time may be sold out.
The current code, for arrivals 8/25-10/2, expires next Monday. Current theory is that mid July will see the release of new codes. What dates those codes will cover is not known. Some people think only the rest of October, some people think October will not get discounts and only November will...it's an unknown at this point.
Suffice it to say that *if* any codes come out after the current one expires, you will hear about it on the DIS first. Keep an eye on the boards.