Isn't that what "Release Announcements" is for?
("Announce and promote your own projects here")
updated game version --> new release post.
Viewing post in A category for updated games
Nope. That is for release. Not for update.
Update announcements are here https://itch.io/devlogs and here https://itch.io/feed and to a lesser extent sorted by updating date (aproved devlog, that is) here https://itch.io/games/newest