https://wccftech.com/android-12-beta-gsi-is-finally-available-for-download/

Google released the Android 12 Developer Preview back in February earlier this year; this was followed by Preview 2 and Preview 3. Google was supposed to release the Android 12 Beta 1 today for all the eligible Pixel devices during the Google I/O 2021. Still, we have just discovered that the official Android 12 Beta 1 Generic System Image (GSI) packages are already available for download.

A GSI is a prebuilt system image that you can boot onto the devices that support Project Treble for those who do not know. The best part is that even if you do not have a compatible Pixel phone, you can still go ahead and install the official GSI binaries to test Android 12, provided your device is compatible with the Project Treble.