Just to give an update here that the official repo is on track and we'll open that very soon which will then open the development of the OSS project. I'll post another link here very soon.
One other thing that I should have posted here is that there's a separate discussion about the log levels for os_log and this logging API going on in the forums. The logging API will adopt the outcome of that, it very much looks like it'll be the syslog log levels.