Bug reports go to QA, so you are right they don’t go straight to the Devs. Depending on what is documented, reproduced, prioritized, etc - determines what the Devs fix and when. I am sure they have some sort of priority matrix somewhere.
QA never comments on the Bug report forums. Our Community Managers sometimes relay info about known bugs, or high priority bugs, but that is about it. That is not a change from how it was before really. It is just that around release there were more urgent game access issues that the CMs did communicate about.
This is the most recent example of a game breaking bug that a CM posed about.
Of course, there are pinned posts about hotfixes, disabled game aspects, etc.
QA though, they are not allowed to post on the forums for any of the Blizzard games, that I know of. That is just a one way reporting mechanism to get things to the right team.