MouseSavers says the offer could end at any time, so apparently Disney has not announced how long the promo will run.

Last year it ran Nov. 8 - Dec. 31 and they were clear on the dates right from the start. We aren't leaving for 29 more days, so I'm not sure what the chances are of us being able to book for next August on the Bounce Back.
I would take the 30% OR some sort of Dining discount.