Hate to say it not too much. Biggest change in two years I believe was the shallowing of the Wilderness Pool, that is now 3.5 feet the entire length. They have tinkered with the Menus a bit but not much. As always they are cleaning and sprucing up the areas but you really might feel like you never left. The Parks on the otherhand are a differant story, the Magic Kingdom especially has been going through alot of updates.