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For a future release how about three map boards with island/reef/wind/whirlpool bits to place on it to create your own maps? Could be loose, or maybe even magnetic (would be pricey tho).
I know I could probably make my own but an official set, perhaps with some all new features would be awesome.
I suspect that someone will make a BGG unofficial add-on that you can mount to a magnetic sheet.
I like the magnet idea.