@Ratbert is correct on all points. We are working on the RoonSpeakers stuff actively, now that 1.1 and iOS are out the door.
I can’t speak to the timelines of specific third party companies, but PS Audio has been very enthusiastic. It wouldn’t surprise me if they were one of the first integrations.
We’ll update with more firm timelines as we get there, but RoonSpeakers is the big project for us right now, just like iOS + new Metadata functionality was over the summer.