One of the people responsible is working on a detailed write-up: https://starfrost.net/blog/001-mdos4-part-1/
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in reply to @techokami's post:
This is multitasking DOS 4. That's much weirder (and not related) to normal DOS 4. The name is incredibly confusing
Oh I know that. But the official release post called it MS-DOS 4, so...