You can get started with Android 16 QPR1 Beta 1 today by enrolling your Pixel device. Eligible devices include Pixel 6, 6 Pro, 6a, 7, 7 Pro, 7a, 8, 8 Pro, 8a, 9, 9 Pro, 9a, Pixel Tablet series devices*. Once enrolled, eligible devices will receive an over-the-air (OTA) update to the latest Beta versions. If you were previously enrolled in Android 16 Beta (and have not opted-out), you will automatically receive QPR1 Beta 1 and any future Beta updates.*

https://www.theverge.com/news/671153/google-beta-android-16-material-3-expressive-design-rollout