I am not so sure I like it.
With threads marked Today, Yesterday etc. is no use when I have been away for a few days. I like to know what day and time the last thread was so I can easily catch up.
Whirlybird, the Private Message, there is a link at the top right of the screen. Underneath the welcome message.
Also, there are the arrows immediately to the left of the message title in the message list, that shows what threads are new, though they tend to blend in more.
Looks like all the adverts have disappeared from the top as well.
Regards,
FP.