Windows Server 2012 R2
Windows Server 2012 R2 RTM
Windows 8.1 RTM
Note: You should check http://support.microsoft.com for the latest version of the different files.
Note 2: These are not available in Windows Update.
Note 3: You can download them without entering your e-mail address and captcha if you are a Microsoft Premier customer and have a http://Premier.Microsoft.com account.
Note 4: Carefully review the list and decide which might be applicable to your unique environment.
Note 5: Test in your test and your quality assurance environment.
Originally published Feb. 2014. Updated Feb. 2014.
The list has been moved to the Technet Wiki below.
List of Hyper-V related hotfixes post RTM for Windows 8.1 RTM and Windows Server 2012 R2 RTM
This should help with getting the list updated sooner with the help of the WW community.