A "global" new outlet has tweeted that HongMeng OS, Huawei's new rumored official ROM for its mobile devices, will be known as Oak OS in non-Chinese markets. Furthermore, this putative new system will be unveiled in the first fall months of 2019. Therefore, this OEM's phones could have as little as 2 more months on Android.
https://www.notebookcheck.net/Huawei-s-new-smartphone-OS-may-launch-in-August-or-September-2019.423485.0.html