Clearing up a couple of things in one go : apparently the next feature-length will not be based on the previously announced Chinese book (forget the title, it's in the archives). Secondly, September 20th 2005 will see a new Studio Ghibli short film, Directed by Yoshiyuki Momose and with music by Capsule.
Prior to this particular short, the coupling of Momose and Capsule has created two other shorts, 'City Plan' and 'Retro Future'. No need for English Subtitles as there's no dialogue in the film. The timing suggests a possibility for this to be included in the Japanese DVD for 'Howls Moving Castle'. Fingers crossed, firmly.
via Nausicaa.net