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The Windows RT 8.1 Preview has been spotted on a Surface RT at BUILD 2013, ahead of its public release in just a few days time.



From Neowin:
A Windows RT 8.1 Preview should be available shortly, along with the standard Windows 8.1 Preview, as BUILD 2013 gets underway. We'll be at the conference to deliver all the news on Windows 8.1 and everything else that's shown off at the event, so be sure to check back tomorrow when the event begins with the opening keynote.
  Windows RT 8.1 Preview spotted at BUILD 2013