Microsoft is experimenting with automatic updates from Windows RT 8.0 to Windows RT 8.1, which would allow users to skip the Windows Store and still get the latest software.
According to Paul Thurrott, the test is aimed at helping users who've had trouble with the Windows Store update process. Microsoft is currently testing automatic updates in select markets, but the company could roll them out more broadly in the future.
In the meantime, Microsoft is also offering a manual download that allows RT users to get the automatic update. It's unclear when Microsoft will offer something similar to Windows 8 users.