They are now available for everyone (you still can opt out via the organization settings).
Archived Hero cards can now be un-archived.
More improvements:
Search: when searching for multiple tags (or titles or content queries) you now can pick whether you want to do an and or an or search for those. It defaults to and.
Conversation notifications: Now behaves correctly when the target notification has been closed.
Upgrading Codecks: There’s now a hint when your Codecks tab needs to reload due to a new update.