There are some really good % off promos going on right now though. Even though it says it's for room only, you can add tickets and the dining plan (at full price) and still get the room only discount. It saved us over $600.00!
I bet the % discount is at least in the ballpark of last year's 4/3 - I think if you are packaging room, tickets and dining that most of the discounts work out within a hundred or so - that is to say they are basically the same if you are buying everything.