Pretty much any discount offering is going to be subject to black out dates and room availability. You wouldn't necessarily be able to automatically convert your package reservation into a discount. You most likely would have to cancel and rebook using the RO discount, assuming that rooms are available at your resort of choice.
It may be that you need to be flexible, they could come out with discounts, but for other resorts, so you might need to be willing to change, if you want the discount. Or, if possible, you might need to be flexible on dates.
Unfortunately, no way of knowing until Disney releases the discounts.