The Windows 8.1 Update is available on MSDN as of yesterday and will be available on Windows update April 8th. Click the image on the right to see a full size screenshot of the update on MSDN.

It is available for ARM, X86, and X64. I am pulling it down now and will be installing to several Surface devices and several Intel laptops. I will update this post with those experiences.

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For more information about the Windows 8.1 update see the official links below

Windows 8.1 Update: The IT Pro Perspective

Windows 8.1 Update – important refinements to the Windows experience