Well you have all the new attractions starting May 5th in honor of the celebration. Also Stitch's Great Escape replaced Alien Encounter. Wishes is the night time fireworks show at MK now. Also Mickey's Philharmagic replaced the Lion King show that was MK. IASW has been refurbished.
Epcot added Turtle Talk at the Living Seas along w/ Nemo doing meet and greets there. Also Mission Space opened. Tapestry of Dreams parade is no more, and was not replaced.
MGM has closed the Hunchback of Notre Dame show.
Pop Century and Saratoga Springs have opened for business.
Ummm... I'm sure there's more but thats what comes to mind right away.
The Stitch attraction, sad to say, has been getting pretty bad reviews. Many say it's still pretty similar to alien-- only now it's Stitch. I haven't been on it yet (I just missed it's opening this past fall).