The OnePlus 7T will be launched tomorrow, and OnePlus has confirmed that the device will run Android Q straight out of the box. That would make it the second device to launch with Android Q, behind the Huawei Mate 30.
https://www.notebookcheck.net/The-OnePlus-7T-and-7T-Pro-will-launch-with-Android-Q.435286.0.html