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Re:Introducing Git protocol version 2 by joatmon-snoo on Saturday May 19, 2018 @09:45AM (#17107879)
Junio posts on the list when there's a new release, e.g. https://public-inbox.org/git/[email protected]...

It seems that https://groups.google.com/forum/#!forum/git-packagers is the closest thing to a formal announcement list that there is.

Re:Introducing Git protocol version 2 by jkaplowitz on Saturday May 19, 2018 @10:44AM (#17108075)
Okay, I guess that tie continues for historical reasons. At least people who don't otherwise subscribe to LKML can still receive Git release announcements via the second link.

I presume Git 2.18 (the first release supporting protocol v2) will be announced via both channels once it's out.