I just made a discovery about another new feature. Lately I've been noticing some posts that have a red (or orange) word NEW after them. I had been wondering how that was attached and how long would it remain, since something wouldn't always be new.
While wondering about it a few minutes ago, it suddenly occurred to me that perhaps it appeared automatically to mark not only a thread with new items, but the actual new items within the thread.
So, I went back to the one I had just read, and sure enough - the NEW was gone!! That's a fantastic feature to have.