I asked the CM this same thing, and she said (read slowly, this gets confusing) as fast as the Disney Rewards is filling up (2.5 hour waits just to talk to a cm...) that she seriously doubts there will be any more future discounts, and if there are, that they will probably be part of the same deal, only now it will be open to the public who DONT have a Disney Rewards card, and that they will basically be the same deal, which means that there will be VERY FEW spots left over from the DR deal. They will be taken from the same pot.... get it? Its hard to explain what she was trying to say, but I understood all of it at the time and it all made sence.
In a nutshell..... dont hold your breath; you might pass out waiting.