I just saw it last week--very impressive looking, and you can see it from around California Adventure. It's not very attractive looking yet--just metal work--but construction is progressing at a rapid pace. Theming should begin this summer, as they are already starting to cover up the metalwork with a preliminary coating of cement before adding the themed layer (with the burn marks from the lightnight bolt). One area of interest--they are already leaving lights on in some of the windows of the building, like at wdw--I pressume just a way to start making things creepy
My parents and my sister left today for Disneyland. I gave my dad instructions to take some pictures of the Tower of Terror being built. So in about a week I should have some to post for you.