Huawei's commitment to improved software updates for at least its premium devices is seeing a lot of evidence these days. Stories on updates for new and new-ish flagships are coming thick and fast these days. First, news on test builds of Android 9.0 (Pie), for the entire Mate 20 line emerged. Then, stable versions of the same came out for some of these phones.
Most recently, the Mate 20 Pro was included in the Android Q Beta 3 program announced by Google at I/O 2019. Only days later, Huawei implemented a program to get this OS on units of this phone. It is the only Huawei device to be certified for this latest beta. However, it now appears that it will not be the only one to run the fully-baked, stable form of the ROM when it is released.
Huawei has reportedly announced that 8 recent releases will be updated to Android Q. They are (again) the various Mate 20s (i.e. the Mate 20; 20 Pro; 20 X and 20 RS Porsche Design edition), in addition to their successors, the P30 and P30 Pro. This adds up to 6 Huawei flagships. The remaining 2 are from Honor: the recently-launched V20 and the well-spec'd Magic 2.
To date, it is not known which version of EMUI (Huawei's skin for Android) these phones will get when Q becomes available to them. Currently, the latest version of this OS is EMUI 9.1, which may be installed on the Mate 20 and P30 lines. However, it is known that, when its successor gets here, it will incorporate enhanced user privacy controls, as well as a system-wide dark mode and better Digital Wellbeing.