There's a lot. From the Haunted Mansion there's a few pictures with the lightning effect, madame leota, and the coffin with hand lifting lid to name a few. Other new decorations I really like are things from Alice in Wonderland (eat me chest, grandfather clock, key on table) as well as King Stefan's castle (Throne, banners, Grand dining table) Pirate theme has some fun things too. Flags and Davy Jones chest. There's a lot more new decorations, those are just a few of my favorites.
Edit: afraid no Hat Box ghost stuff, but that would be cool