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According the the Gainax blog, the first true trailer with new footage for the GL movie will be attached to Japanese live-action movie "The Hidden Fortress: The Last Princess", which is written by GL's series composer Kazuki Nakajima and directed by Gainax veteran Shinji Higuchi.

Oh, and co-production for the movie is by IG... last time Gainax worked with them, we got FLCL.