Some fixed issues (related with Hyper-V and WSFC):
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2972257 Windows Server 2012 R2-based cluster freezes on multiple nodes when you add, rename, or remove disks
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2972254 Hyper-V virtual machines cannot be connected to sometimes when TCP connections reconnect in Windows Server 2012 R2
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2978102 Cluster nodes stop when multiple physical disks in storage space are disconnected in Windows Server 2012 R2
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2978101 Windows 2012 R2-based Hyper-V host cluster freezes when virtual machines use shared virtual hard disks
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2978691 Stop error when scrubbing task takes a long time on a Windows 8.1 or Windows 2012 R2-based cluster
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2976884 “Access denied error” when Hyper-V Replica Broker goes online in a Windows Server 2012 or Windows Server 2012 R2 cluster
Prerequisites:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014
How to install:
CAU (for clusters) + Windows Update + WSUS or manual installation
More info: http://support.microsoft.com/kb/2975719