Every forum that existed before the change still exists. Only the location has changed. Prior to this update, almost all of the forums were directly on the home page of the forum. They can now be found in subforums.
To assist people in finding stuff in the forums that we think is important, I've added a new section at the top of the forum home page called "Featured Topics". This will contain direct links to areas of the forum that we'd like you to visit. These links will change from time to time as needed.
In the next post (below) I will show you the previous organization of the forum and the new one. As you can see, we've reduced the number of top level forums from 26 to 7.