DW's Toon Town has Mickey and Minnie's houses including Mickey's garden and garage, Donald's Boat (a water play area for the kids), Goofy's Barnstormer, the big tent where they have character greetings and a store, a train station, a small child's playground (not near as impressive as Pooh's playground, imo), and various little sales carts. I think that is about it...all that comes to mind.
I'm a little sad about seeing it go since my youngest loves going through there while the other kids ride things with Daddy. It's also where the kids rode their first roller coaster. I remember when it opened, so it is weird to think it won't be there soon. At the same time, I think I am going to enjoy the changes they are making and I think the kids will as well.