This is unconfirmed speculation, of course, but could be
The Wind Rises (風立ちぬ
Mr. Miyazaki's next movie as a director? Well, some evidences suggest that it is.
Some of those evidences were spotted days ago (
http://blog.livedoor.jp/nyussoku/archives/51947498.html, for example) thanks to the
NHK documentary
Poppy Hill: 300 Days War of Father and Son - Hayao Miyazaki & Goro Miyazaki (
http://pid.nhk.or.jp/pid04/ProgramIntro/Show.do?pkey=106-20110820-21-27096) aired this previous month, that included sequences of
Hayao Miyazaki working on that next project, and displayed what seems to be characters (
Giovanni Battista Caproni, and also its
Ca.48 airliner was present) and events (The Great Kantō Earthquake, of 1923) from his illustrated novel published in the magazine
Model Graphix.
And now that also on this month's
CUT magazine there is an article with
Mr. Miyazaki giving more information about the project, including the mention of the protagonist as a "Japanese man who developed weapons of war" (that would be
Jiro Horikoshi, of course) and other revealing information, all apparently suggests that buddies like
Xavier from
Buta Connection (
http://www.buta-connection.net/accueil) or
Álvaro from
Generación GHIBLI (
http://generacionghibli.blogspot.com/2011/09/kaze-tachinu-podria-ser-la-nueva.html) are spot-on with this assumption...
So much work for the studio, though, as
Toshio Suzuki talked about approximately... 250000 sheets (simply incredible!) as necessary for the animation, and they mentioned a good amount of cuts involving big crowds of people and all that... exhausting!