The Developer Preview 2 version doesn't bring many visual changes. Most of these changes occur in the background and with the API set within Android. Hence the reason why this version follows as "Developer Preview" and not "beta".
You will not be able to install this version via OTA. Instead, you will need to download the image and transfer it to your device. Google will start shipping OTAs when the Beta program launches in May. It is also still only available for the Pixel line, starting with the Pixel 3. Other devices will support Android 12 when the Beta program opens.
What's New in Android 12 Developer Preview 2
Security
Google has a pretty long list of changes for developers. Including some lock screen changes. Google has even added extended security for lock screen notifications. This includes making it easier for developers to configure lock screen notifications to always require user authentication.
Picture-in-Picture
There are also improvements to the Picture-in-Picture feature, allowing developers now using Android 12 to automatically transition their app to picture-in-picture mode. This new version of Android also brings features for developers to seamlessly resize picture-in-picture elements.
Connected devices
Finally, Google is bringing APIs to manage connected devices. This will make it easier for developers to keep their apps running on companion devices. Android 12 Developer Preview 2 introduces APIs that automatically wake up relevant apps when connected devices are nearby.
You can download the second developer preview by clicking here. And, if you want more details about Android 2 version 12 DP, you can go to the version details page.
