The Chinese OEM ZTE has revealed that it has a version of Android 10 ready to go. This MiFavor 10 OS is slated to confer numerous UI and system improvements on the devices that will update to it. They include a dark mode, an AI engine upgrade and new dynamic wallpapers.
https://www.notebookcheck.net/ZTE-s-Android-10-skin-will-be-called-MiFavor-10.445920.0.html