I went in January. In the end the discount for packages was:
- Free ticket upgrade of park hopping and plus options
- Room discount (I think it was about 10-15%, but might have varied by resort).
I think there might have been some other room discounts. If I remember, they actually had two rounds of discounts - they announced one, then they announced more (it might have been the package first, then the room-only or something). There was also some nearly useless thing thrown in, like some coupons for Planet Hollywood. You might be able to look through archives on the resort board or general trip planning board and find more.