From Calyx team on reddit:
Android 16 was released to AOSP yesterday but with a one big difference than typical releases: * Google did not publish any device-specific source code for supported, modern Pixel devices. * In previous years, Google released full device trees alongside new Android versions. This allowed developers to build and boot AOSP on Pixel hardware relatively easily. * With Android 16, only the platform/framework code has been released. The device trees are missing, at least for now.This means AOSP 16 cannot currently be built or run on any recent Pixel device easily just using official source. It’s unclear whether this is a delay or a policy change. Either way, it seriously disrupts custom ROM development and our porting efforts.
Google later issued something like a denial:
We’re seeing some speculation that AOSP is being discontinued. To be clear, AOSP is NOT going away. AOSP was built on the foundation of being an open platform for device implementations, SoC vendors, and instruction set architectures.AOSP needs a reference target that is flexible, configurable, and affordable – independent of any particular hardware, including those from Google. For years, developers have been building Cuttlefish (available on GitHub as the reference device for AOSP) and GSI targets from source. We continue to make those available for testing and development purposes.