Excuse me if I'm covering old ground as I seem to remember a change with how "New Posts" worked a while back.
What's a little annoying is when you open a "New Post" and don't think to take note of where it originated from so finding it again is difficult.
I realise I could subscribe to the thread thus creating a list of subscribed threads and navigate from there but what I would prefer is a fixed list of posts in the order of time they were posted then an option to view only the New Posts within the list.
Otherwise I can live with the way things are :)