I signed up just to request this very feature. Currently if a new chat message occurs in a forum, the forum name turns yellow to indicate the new content. However, new comments in Posts don't update the forum name. Much of the content in our group takes place as post comments, so it's difficult to see when new content has arrived. And the Post Stream isn't a good solution for this.

Perhaps having clickable badges next to the forum names for direct access to new content is a good way to go.