Features confirmed through the leaked material:
15W Wireless is charging, SuperCharger 2.0 (40W?) microSD + nano SD, stereo speakers, 3D Face Unlock, in-display fingerprint scanner.
According to the source:
Mate 20 sports 6.53-inch IPS LCD FHD+ display, Kirin 980, 4GB RAM and 128GB ROM, 24MP front-facing camera, 4000mAh battery, 3.5mm jack and IP53 rating.
Mate 20 Pro sports OLED QHD curved display, Kirin 980, 6GB RAM and 128GB ROM, 4200mAh battery, IP67 rating and lack of a 3.5mm jack. Both models come with Android 9.0-based EMUI 9.0.