Similar to the Orange and Green dots found above the cell signal bars on an iPhone (which indicates when an app is using your handset’s microphone and camera respectively), Android 12 beta 2 users will see microphone or camera indicators when apps are using those two sensors.
A new “Internet” tile in Quick Settings will show you your phone’s online connections including the name of your Wi-Fi network. Tapping on the Wi-Fi icon will allow you to quickly disable your Wi-Fi connection and will also show you a list of nearby Wi-Fi signals and give you the option to turn off/on your cellular network. The update also adds a GPay tile to Quick Settings to replace “Cards & passes.”
If your Pixel is your daily driver, you might want to wait for the final version of Android 12 before installing it. After all, the Android 12 beta 2 update is not stable and apps that you might need for work or play might not be working at full capability during the beta testing.