It's certainly not the Highwind, but Square-Enix has recently released the first artwork for the airship to be featured in the higly anticipated release of Final Fantasy VII: Advent Children. Aptly named the Sierra, it was seen briefly in the E3 trailer for the film, but you can find a couple pages worth of design here.
And for good measure, the page also reveals collectible action figures based on the character's from the movie. Yes, even you can do crazy acrobatics with Tifa now.
[Sources - GAF]
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