India's customs database Zauba lists spare parts for the Galaxy S7 (SM-G930F), and while the warranty void seals aren't overly exciting, the waterproof mic and sim tray sort of are. It's unclear what the HRM and Octa components stand for, but it's all about the keyword "waterproof" here. And with quantities in the thousands, it's reasonably certain we're talking mass produced final components.
Samsung is going back and forth with the waterproofing and after having IP67 certification on theGalaxy S5, chose to omit it for the current S6 generation. That only left Sony as the major manufacturer to offer waterproof smartphones, though the Japanese company subsequently revised its policy on actual submersion. We'll wait and see what exactly Samsung will let you do with the Galaxy S7 under water, and under warranty, that is.