Windows ADK 8.1 update (for Windows 8.1 Update) is available for download:

The Windows 8.1 update (for .1 Update) is available for download:

Windows 8.1 update (direct download only: http://www.microsoft.com/en-us/download/details.aspx?id=39982

You still run adksetup.exe to install or download the ADK, but you do see that the new is slightly bigger than the previous kit. The Patches content also have a higher number. The October 18, 2013 release of .1 had a folder named 8.100.20, but the April 2, 2014 release of .1 have 8.100.2669.

New features in 8.1 are the WIMBoot option, to dism, updates to WinRE and a new WinPE version (5.1). There are also fixes for USMT.

Important Change:
DISM: Does not support Windows or Windows images.

More info about the changes here: http://msdn.microsoft.com/en-us/library/windows/hardware/dn247001.aspx

Info on updating WinPE 5.0 to WinPE 5.1: http://technet.microsoft.com/en-us/library/dn613859.aspx

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