Mike, do you not know how to look at a world you're not in under the new interface? From the World Center, click on the world. You see that strange new front page for a world that's not yours-- but at the bottom of that page is a link to the world chat. Click on it, and you see the world's chat page as you would see your own world's, including the navigation bar at the top. The nav bar works just like it used to; that is, you can see everything under the "world" menu on the nav bar.