This blog entry shows a couple of last-minute changes, but I haven't found any release notes yet. However, here is a list of development hightlights blog posts [0] and the 6.0.0-rc1 milestone page [1].

[0] https://www.kicad.org/blog/categories/Development-Highlight/

[1] https://gitlab.com/groups/kicad/libraries/-/milestones/1#tab...

thanks, that is indeed more informative, especially since i couldn't find a changelog in the sources.

The 6.0 release hasn't been made officially yet (the source code tagging is just the first step in that process). There will be an announcement and changelog once it happens.