I think phrasing it as "also now include CommonMark" is a little misleading, it has been around for a few years now and the entire goal is to take the quotes of

I think phrasing it as "also now include CommonMark" is a little misleading, it has been around for a few years now and the entire goal is to take the quotes off of the "standards" to actually have a Markdown specification. The drivers behind it also include (IIRC) GitHub and StackExchange. That said, I did not notice the "GitLab Flavored Markdown" in the story link but I'll be fairly disappointed if it is actually "yet another Markdown pseudo-standard" and not CommonMark.