You do not need to open each forum to see what is new.
Click Forums on the green bar
You will then get a screen come up with the forum headings.
Either click the blue box at the top “latest replies” or scroll down to below the advert at the bottom of the forum headings list
There you will find a list that is basically the same as the old “latest posts”. Click the date/time of the last reply to be taken to that reply or the heading to go to that active topic.
Having read that topic you do not need to return to the previous screen, again just scroll down below the reply box and advert and you will see the list again.
EDIT. Also possible to view “latest Replies” without the need to log in, it’s been that way for several days now.