Canaan has added the avalon9 branch to their cgminer repository on GitHub. It looks like the first of the A9 series will be called the AvalonMiner 921.

Options to tweak the voltage level ("--avalon9-voltage-level") and the voltage level offset ("--avalon9-voltage-level-offset") remain.

The A921's default temperature target appears to have been bumped up to 97°C. The cutoff temperature remains at 105°C.

The default fan speed percentage remains at 100%.

The OpenWrt firmware for the A9 series appears to be incompatible with earlier AvalonMiner models. This means that it would be not possible to run a mix of different generations on the same Raspberry Pi.

Release binaries for the A921 that incorporate the most recent commits from the avalon9 branch have not been released yet. The latest release binary of the A921's OpenWrt firmware is dated June 28, 2018 at the time of writing. The nexttesting directory is dated September 10, 2018, but is empty at the time of writing. This means that there could yet be further changes to the A921's cgminer code before its first release.

The A921's MM firmware, however, has been released. The latest release, at the time of writing, is dated September 10, 2018, and its changelog simply says: