Pex posted on the Official Forums that they're working on getting an update out.  The current plan is to start is around noon PDT, and it should last for about two hours.  During this time the game and website will be unavailable.

The servers are back online and Pex has posted Update Notes:

• The Free Realms Trading Card Game’s First Expansion, Shattered Past, is now available!

• Rock out with The Dares at the daily mini-concert at 5 PM (PST) in Snowhill!

• A new ‘Take Me There’ in your quest helper will automatically take you to your next quest target.

• A new ‘Stuff To Do’ button has replaced the quest journal button.

• You can now teleport directly to any icon on the atlas.

• Guild lists will now properly update when members log in and out.

• Fixed an issue that could cause a crash when playing the TCG against the computer.