As far as iconic Japanese fighter planes, they don't come more iconic than the Zero. Imperial Japan built more of those aircraft than any other plane during World War II. Starting the war with a kill ratio of 12 to 1, the plane combined maneuverability with long-range capability. The plane was also used in kamikaze attacks, especially as the war's end neared and the situation for Japan became increasingly desperate. The story of Dr. Hirokoshi and his plane sound like they'd make good film fodder, but does that mean a definite Studio Ghibli anime? The studio hasn't comment, but some Japanese anime insiders are convinced.
"Mr. Miyazaki's new film is about the man who developed the Zero fighter," wrote Kobayashi on his Twitter. Another animator, freelancer Takashi Hashimoto, chimed in and tweeted that Ghibli was "eagerly searching for animators who could draw airplanes" before work on this anime began. He added that he saw storyboards and added that it's unfortunate that Yoshinori Kanada, a key animator for Miyazaki, was not alive to work on the project. (Kanada passed away in 2009.)
Kanada's wife then tweeted that her husband loved airplanes and would've wanted to be a part of this production. "It happened too late," she added. "It's unfortunate."
If Studio Ghibli does make a World War II, don't expect militaristic chest beating. Studio Ghibli head Toshio Suzuki previously stated that he was glad Japan lost World War II.
Studio Ghibli also previously stated that Miyazaki is working on a biography—but it did not say whose biography. If these tweets from Japanese insiders don't add fuel to this speculation, there's a YouTube clip from 2009 in which Miyazaki checks out a model Zero in flight. Miyazaki can be seen at around the 3:30 mark. But will a Studio Ghibli film on the Mitsubishi Zero be seen in theaters? Stay tuned.