I am wondering if the news and enhancements of importance to
CinGG/FFmpeg 6.1 users may  be outlined, including what is ready now and
expected upcoming next?

Although not exactly as requested, I have updated November News to better outline what CinGG takes advantage of in the 6.1 version of ffmpeg.  If you can think of anything I left out as it pertains to Cinelerra, please email that.  A lot of the new features are only really relevant on the command line and these are best outlined in many places on the internet already.  In addition I have minimally tested new formats of WBMP and HDR and have the ffmpeg/video directory format files ready for GIT checkin.

I have tried testing AV1 capability with little success yet, but will continue to see if I can get an updated dav1d library version update for newer operating systems.

https://www.cinelerra-gg.org/news-updates/november-2023-release-and-build-farm-announcement/