I can't recall seeing posts in those sub-forums though, so that might just be because there was no update to give you?
Edit: as part of the "new posts" link on the forum, you get offered a "past 24 hours" search if there are no unread new items since your last look. The direct link is this one. Try that and see if there's any posts in the forums you are interested in to confirm if an email should have been sent to you for those...