A few more:
Winnie the Pooh got an interactive que line
Good old Obama was added to the HOP
Captain EO was reopened
The Spectromagic parade was replaced with the Mainstreet Electric parade (barf)
Something that may not be new, but I just noticed it on our last trip (Aug '11)... During the shows on the MK stage during the afternoon, the characters (Mickey, Minnie, Donald, Goofy) mouths open and close with their dialogue and their eyes open and close with their expressions. Small change but really makes the characters come to life. This might be old news, but I never noticed it before...