Possible Mate 20 camera features include Underwater Mode & Video Bokeh

Alleged Huawei Mate 20 render
Overall, it seems as though the features are centered around recording video. Kicking things off appears to be a new Underwater Mode which, according to strings of code, this will allow users to “take clear shots in underwater environments.” By pressing the volume down button owners of the device will be able to take a picture, and volume up will open up access to video recording. Another interesting detail is the fact that Huawei references its own upcoming waterproof cases. This means that the Underwater Mode will not be limited to water-resistant flagships.
source: XDA Developers

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