Huawei has confirmed that - beta of the Harmony OS 2.0 SDK will be available from September 10, 2020 (today). Aimed towards smartwatches, TVs, and car head units initially.
A beta SDK version for smartphones will also be made available around December 2020.
This project would be the open-source version of the Harmony OS project. The idea here is pretty similar to the AOSP project for the Android OS - providing an open-source approach for the masses to work on independently
Huawei says it will fully open Harmony OS before October 2021