And if you've just been scrolling thru the Forums, and opened a thread by clicking on the thread title, there's a 'Jump to New' button on the top right just above the first post in the thread - next to the 'Watch' button. Clicking on 'Jump to New' will take you directly to the first post in the thread that your cookies show you haven't yet seen...this new forum comes up to the discussion page, which is the headlines of topics. Click on the "What's New" header icon, and you will have the up to date posts

And if you just want to go to the last post in any thread, that can be achieved by clicking on the Date/Time line for that thread on the far right of the page, just above the name of the last person who posted.

AFAICS, almost all of the same functionality of the 'old' platform is available on this new platform, just not always accessed the same way - so if you want to do something that you used to be able to do, you might hafta look for it a bit, or maybe ask in the Forum Support & Testing section or by DM to a Mod; but the chances are that it's here somewhere.
