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Looks like Apple is doubling down against Samsung and making the Apple iPhone 8 fully waterproof.
Source: https://www.macrumors.com/2017/06/14/wistron-next-iphone-waterproof-wireless-charging/
Of course, this waterproofing has not been officially confirmed by Apple. Although, macrumors has always provided accurate info way earlier than official statements from my experience.