The beta site is based on improved search engine and it has a number of interface improvements. but the content is the same. The home page has changed so there's now 2 buttons below the search bar. The results page also is a lot spiffier. Note the calendar. Click on a year in the taskbar and you'll see a graphic rep of the days a site was archived. It's big improvement over the old lists.
All in all, this is rather cool.