Update 1 (04/01/2020 @ 09:30 AM ET): The Verizon variant of the Motorola Moto Z4 is also receiving the official Android 10 update. Scroll to the bottom for more information. The article as published on March 13, 2020, is preserved below.
Long before the rise of the Android One program, Motorola decided to ship a close-to-stock version of Android under the management of Google. After being acquired by Lenovo, the situation deteriorated over the years. No more blazing fast updates from Motorola anymore, along with the fact that the Moto Z lineup does not carry a true and proper flagship anymore. To rub salt on wounds, the Motorola Moto Z4 will reportedly get only one major Android OS version update.
A bunch of Motorola phones recently received the Android 10 update over the air, and looks like the Moto Z4 becomes the newest member of that club. The OTA is hitting US retail Moto Z4 units and carrying the version number QPF30.130-15-7. The included security patch level is January 2020. Owners of the phone can now enjoy features like system-wide dark mode and the new gesture-based navigation.
Motorola's US-specific website does not mention anything about this particular build as of yet. Moreover, we can't spot any reference of the Android 10 related kernel source code for the Moto Z4 (codename: foles) inside the official repository of Motorola. It could be possible that the current build is part of a soak test conducted by the OEM, while a full-scale rollout may be in the works. On the flip side, the Verizon variant of this phone got the January 2020 patches in the form of Android Pie-based PDFS29.105-74-10 build just last month, thus it might take a few more weeks (or months) for the new firmware to reach to the carrier-specific model.
The fourth-generation Moto Z was initially speculated to be a high-end Qualcomm Snapdragon 855 device, but it turned out to be a mid-ranger with the Qualcomm Snapdragon 675 SoC. The phone runs Android Pie out of the box, as well as has the ability to use Verizon's 5G network via the 5G Moto Mod. Thanks to Motorola's decision, the official Android 11 based firmware will not land on this otherwise capable device. So users will have to stay content with their Android 10 update.
Source: /r/MotoZ
Update: Verizon Moto Z4 is also receiving its Android 10 update
Users are reporting that the Verizon variant of the Motorola Moto Z4 is also receiving its Android 10 update through an official OTA, with March 2020 security patches.
Source: Moto Z4 XDA Forums, /r/MotoZ