Information has been obtained which should allow FFADO to control basic audio streaming operation without a huge amount of effort.
Getting control of the onboard DSP and mixer, however, is likely to take considerably longer because the required information is not available. Furthermore, to code support for this, physical access to a UCX will be required to facilitate debugging. At this stage I (jwoithe) cannot see myself able to afford a UCX in the short to medium term for this purpose. We'll have to wait to see how things pan out over the next few months.
At least partly due to the issues noted above, there is no ETA on any aspects of UCX support at this stage.