The posts that are pinned at the top of each forum/category have always been pinned there. You now have the option to unpin them yourself. Mentioned above, you can either click the pushpin icon next to the thread title to unpin, or you can click “unpin this thread” at the end of the thread.
There’s also a setting in your preferences that you can customize to decide whether or not you want pinned threads to unpin automatically when you’ve scrolled through to the end of them (read the thread).
You can do this. We currently have the home page set to take everyone to a general forum/category list that resembles the old site. However, there’s a Latest view tab that will list threads with recent posts. There’s also a New tab that lists new topics that have been created in the last few days. Using the Categories drop-down menu on the left you can sort either of those options by a specific forum. Here are screen shot showing Latest and New in Around the Farm, for example:
There’s even a red line to show you what content is new since your last visit to the site. Does that help?