Google just dropped the second Android Q beta for all three generations of Google Pixel smartphones, but they also released system images that will allow for any Project Treble-compatible smartphone to flash Android Q! Yes, Google has finally released generic system images (GSIs) of the latest Android version. That means non-Pixel smartphones can test the latest Android version, too.
Finally a benefit of Treble is showing up. A small benefit though, because these GSIs only work for devices that launched with Android 9 Pie.
OEMs are still the ones responsible for pushing Treble based updates, so it has hardly changed for those that don’t buy flagship devices, with the option to unlock the bootloader.