AnimeNews Network has posted the trailer, they picked up from Kadokawa Shoten’s Movie Walker website and YouTube, of Mary Pope Osborne’s The Magic Tree House. The movie’s animation is based on Ayana Amako’s artwork that is used in the Japanese editions of the books. This will definitely be one for libraries to keep their eyes out for when it becomes available to purchase in the U.S.
http://www.animenewsnetwork.com/news/2011-10-31/magic-tree-housebooks-anime-film-trailer-streamed