Yeah Rob, it still appears to be happening. Today it reported "New Posts: 19" and when I clicked on that it went to the results screen "Results 1 to 10 of 10." and that included a few extra posts under the header: "The threads below have not been updated since your last visit but still contain unread posts."
When I navigate to "Forum" -> "Quick Links" -> "Today's Posts" I appear to get the same number of results as when clicking on "New Posts: 19" so I think "New Posts: 19" is just showing "Today's Posts".
And just in case, I am not talking about the "What's New" link which shows a summary of replies and threads.