Is there somewhere that changes from one version to the next are posted?
Something for the nightly releases?
I haven't updated since December but since there hasn't been anything on the main page since the release of 2.7.5 in October, I don't know whether any changes really matter to me.
BTW: are nightly builds based on current git HEAD? That information would help, because we can always lookup the commit history on github (and be guessing which commits went into the nightly build).
The build nodes generating nightlies uploaded to vsWin64, win64, appImage4 and osx_catalina directories track git master HEAD (there was a period of time a few months long as they were following the HEAD of the ffmpeg4x branch before this branch was merged into master).
The build node uploading to win32 tracks the HEAD of the legacy-compat branch.
All nightlies display the hash of the commit they were generated from in the "About" dialog (well, this is sometimes broken in VC++ nightlies only).
Usually, there are no announcements as long as nightlies are considered to be more or less workable. All changes are always publicly visible from the commit log of the respective branch.