It seems that Huawei is actively testing Android Oreo for smartphone Mate 9. There are screenshots of this version with EMUI 6 overlay.
Android Oreo for Huawei Mate 9 is successively tested. Unfortunately, it will not be faster on this smartphone than the debut of Mate 10, which means at least after October 16. Anyway, some of the headphones from this manufacturer will receive an update to Android 8 and it looks like the first one will be just Mate 9. The XDA forum has released screenshots of the beta version of Android Oreo with EMUI 6 overlay on Huawei Mate 9. In addition to Many new features known from the "eight", Mate 9 will gain the option of screen resolution (Full HD or HD). You will also be able to add a button to the navigation bar, which will become invisible when pressed. Restore it with a suitable gesture. Mate 9 will also receive a Picture-in-Picture or a new floating dock. I believe that Huawei Mate 9 owners will definitely be happy with the new capabilities that will bring the update. Let's hope the company makes a surprise and will release the update by the end of October. Source: XDA