I think I understand your question...and some of the answer depends on the type of wedding you are having (custom or intimate).
If you are talking about rooms for you and your spouse to be, Disney does not offer any discounts when booking your intimate wedding. However, because accommodations are no longer included as part of the package, you are able to take advantage of any other discounts you can find! AAA, DVC, AP, etc.
For a custom, I believe if you meet the minimum stay requirement, there is a free night stay at a resort.
Now, I believe (but could be wrong) that there may be some discounts available for your guests accommodations.