UPDATE: Good news - the update has been released. We'll post a summary later, but we can tell you now that there are ShopBuilder updates - to see them, you need to select the Shop widget on your shop page, and click on the Update tab.
We will be rolling out an update to the software between 10:30 and 11:00 GMT tomorrow, 15th December 2011. There may be a momentary service disruption, but this should be unnoticeable. We recommend that users save any changes before this time. After this time, we advise customers to hit refresh on their browsers to ensure they have the latest version.