https://arstechnica.com/gadgets/2021/10/android-12-gets-a-source-code-release-but-not-a-pixel-release/

Here's a strange development. Plenty of people thought today would be the official release of Android 12, which would make the nearly eight-month beta process one of the longest ever for Google's latest operating system. Today, Google is releasing Android 12, sort of—but only in source code form. There aren't any day-one updates for any device, even the Pixel phones.

Android is developed in secret (though nothing is really secret when you have an eight-month beta process) and then released as open source code once it's done. Usually, this also includes a release to Pixel phones—one of the big benefits of owning one. Today, with the source code release, Google's blog post says that Pixel devices will get the update "in the next few weeks."