Apparently, Microsoft has temporarily removed the Windows RT 8.1 update from the Windows Store because it was causing update issues for a "limited" number of users. This information first surfaced on the Microsoft forums from an employee with the username Reagan_L.
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How to create a USB Surface RT recovery image to fix Windows RT 8.1 update issue
If you're planning to update your Surface RT to Windows RT 8.1 this weekend and couldn't find the update in the Windows Store, now you know why and don't need to keep looking for a solution.
In the forum Reagan_L explains:
Windows RT 8.1. Microsoft is investigating a situation affecting a limited number of users who are upgrading their Windows RT devices to Windows RT 8.1. As a result, we have temporarily removed the Windows RT 8.1 update from the Windows Store. We are working to resolve the situation as quickly as possible and apologize for any inconvenience. We will provide updates as they become available.
