A long maintenance just concluded that was necessary to move the page from an old to a newer database connection. This change was required by Blizzard. If you want to know all the details, you can read the full announcement
So what has changed? Not much, sadly. Xu-Fu is a bit more future proof and things won't break suddenly, but there are no new features now. Things might load a little bit faster now and all new pets can be imported into you collection (like the Anima Wyrmling
), but that's it for now.
If you notice any errors or things not working anymore, please reach out to Aranesh