We snoop around the notch area and pull out the familiar-looking front camera / 3D face unlock assembly. It doesn't seem to completely mate up with what Huawei showed during their launch event, but our best guesses include:

Dot projector

24 MP, ƒ/2.0, 26 mm-equivalent lens, borrowed from the P20 series

Rangefinder / proximity sensor

Flood illuminator

Ambient light sensor

IR camera

Rectangle of mystery