Most of the added 3.4 stuff is listed here: current OSX Build - #98 by MStraeten
Both build are for testing purposes only, so backup your darktable settings and xmp files before using it. While the release 3.2. tag might be quite stable - fundamental changes are very unlikely, the 3.4 contains several work in progress stuff. So there might be changes until Christmas breaking edits done with earlier development builds.
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