The reservations which extended the original July 15th deadline (I think that was the date) were not released until mid to late June. Following that logic, I would expect not to see these release until mid to late September. They are probably doing them in blocks to see which months fill up (summer months versus back to school months) before they determine if this will be a permanent meal at the restaurant.
But, as with Disney you never know. They may very well open before September but I wouldn't count on it. All we can do is keep watching and be sure to post if something opens up so others can know.