Codes work like stand by flights. The more vacant rooms - the more discounts.
I have booked MANY clients for the week of the 14th -21st and I was already having problems getting the resort of their choice BEFORE any discounts were released.
MYW packages, combined with DL's 50th birthday celebration has left little room for discounts for the entire month of May. YES, Disney has been THAT busy since the release of the MYW packages.
Personally, I'm shocked that they even released these codes. Glad, but shocked.