In 2010 the pins and public offers for deluxes were 40% off. In 2012, the maximum discount I have seen is 30% thus far (not inlcuding pin offers).
Also, they changed around some of the disney "seasons" (value, regular, summer, Fall, Peak, Holiday) beginning with 2011. Value is the least expensive regarding room rates. When we went in Fall 2010, the week we went used to be value season...however, that same week is now Fall season which is pricier.
Also, for 2011 and 2012, there are now more room categories which add to the price as well. Mousesavers dot com has a decent explanation
http://www.mousesavers.com/roomrates2012.html#notes. Scroll down below the list of hotels to get the explanation.
Discounts are actually relatively new to Disney (the last 10 years or so) and they did mention at the end of 2012 that they are doing away with the discounts. And I have seen the discounts go down in the last 2 years.