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We're currently in the review process for the iOS App Store, which unfortunately makes timing unpredictable. We're working on it, though and will update via the newsletter and Twitter as soon as it's released!
The app does not yet support Android live wallpaper, but we plan on adding that feature in the future. This will be Android-only, as iOS does not (yet) support live wallpapers.
Joseph's demo actually uses modified versions of the original Seize the Day art; Wizards of the Coast and Acclaim Entertainment commissioned updates and expansions to a few of the images for their game Magic: The Gathering - Battlemage, and those are the images Joseph used. There isn't a complete set of 12 months in that size, however, nor are any of the overlays made for that size. Because of that, and to as faithfully as possible re-create the original Seize the Day worlds, we're using the original graphics.