Erfanoabdi has successfully booted up Android 9.0 P Developer Preview on the Moto Z thanks to unofficial Project Treble compatibility. The developer has also shared images showing the Interface and About Phone Settings section.
He used his script “Capire Le Treble” which allows him to flash a device-specific system image on different devices without a /vendor partition to flash modified Android P DP1 Image from Google Pixel XL (Marlin) onto his Moto Z which was running Official LineageOS 15.1.
XDA notes that Camera, WiFi, Radio and few other things are not working as of now. However, the developer managed to get Moto Mods working.
There's no information when Android P Port will be available for Moto Z users.