Some of them are already highlighted in the release notes draft (a really work in progress documents): darktable/RELEASE_NOTES.md at master · darktable-org/darktable · GitHub
But there are many pull requests (upcoming changes) that are still to be merged/developed/reviewed/discussed… You can have an insight here (sometimes really technical, sometimes understandable by anyone): Pull requests · darktable-org/darktable · GitHub
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