All the links are working and all sites have the correct thumbnails.
The new version is much more integrated and looks similar to the rest of the new tab interface. In contrast to the new test, the previous one takes you to a separate web page with various links. Last year, a similar experiment appeared that also allowed access to a number of recommended websites, still available to this day. A new experiment in the form of a 'Top sites' shortcut has surfaced, linking to an overview of some recommended websites seemingly based on location and interest.
The new tab page, in particular, is always changing and some experimental features in Chrome's developer version Canary give us a glimpse of what Google might have in mind for it going forward.
Google Chrome sees a constant stream of new, sometimes redundant features implemented by its developers, but not all of them end up in the stable version of the browser.