Microsoft Confirms It Is Dropping Windows 8.1 Support

Microsoft announces that in May Windows 8.1 will not be patched, and that users must get the Windows 8.1 Update if they want security patches.

For those users who are still using Windows 8 you are unaffected and will continue to receive updates as normal.

More detailed information can be found in the following links:

KB2919355 (Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014)
http://support.microsoft.com/kb/2919355