A Huawei official has unveiled the first two stages of the Android 9.0 Pie update schedule. A new version of Huawei's custom software - EMUI 9.0 - will be shown off at IFA this September. Then the updates start.
The Huawei P20 series is getting it first, starting in September (it's not clear if this will be immediately after IFA or later on).
Huawei P20 • Huawei P20 Pro • Huawei P20 lite
Next up are the Huawei Mate series with no hard date. Presumably, this means the Mate 10 family, but doesn't exclude the Mate 9 phones.
Huawei Mate 10 • Huawei Mate 10 Pro • Huawei Mate RS Porsche Design • Huawei Mate 10 Lite
What about the others? Huawei has plenty of Kirin 970-based Honor phones and its GPU Turbo update was released on all of them, so there's a good chance they will be included. The Honor 10 and Honor View 10/V10 were mentioned in a leak earlier this month. Hopefully, we'll get a more detailed roadmap at IFA.