As for user-facing features, today’s update adds scrollable screenshots, allowing you to capture an entire conversation thread or webpage in one screenshot. Google also improved auto-rotation on Android phones by using the front-facing camera to determine which direction the screen should be rotated at any given moment. 
Additionally, Android 12 improved on-device search by allowing third-party developers to make data buried deep inside their app available to the device search feature. For example, you should be able to search for a specific email using the device search field, or for a location in the Yelp app. 
This release marks the third public beta release in Google’s published schedule. The next release, in August, will be a platform stability release – which should be very close to the same build that Google will officially release shortly after that. 
If you have a Pixel phone, you can sign up to take part in the public beta right here. Have a non-Google phone? Visit this page to see a list of device makers and the respective devices the beta is available for.