Masayuki Miyaji oversees the production with key visuals from Okama while Ichirou Okouchi will be working on the scripts. The trailer itself speaks for the plot with great animation and amazing environment! If you want to see the beautiful setting in the movie you can check out their official website here as it will give you great visuals of the upcoming film.
Further research using google about the novel gives very little information. It would be nice if we can get a copy of the novel as it intrigues me a lot. The only problem that I can see is if there's a good english translation of it.