OnePlus will replace the 8T as its newest flagship soon. However, the OEM has news for those who would prefer to stick with the phone: it is now part of the Open Beta project at the company. This channel of new Android updates might unlock access to new features before they hit the "normal" stable versions.
https://www.notebookcheck.net/OnePlus-announces-an-Open-Beta-Android-update-program-for-the-8T.527852.0.html