Another update for Server 2012 R2. A lof of issues , related with WSFC and Hyper-V, have been fixed in this cumulative update:
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2961977 “Hyper-V Replica Cluster Broker is not installed” error when you replicate private clouds to Windows Azure
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2964723 Connectivity lost between two nodes when a node reconnects to a Windows Server 2012 R2-based cluster
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2964725 Removed nodes can access shared disk resources unexpectedly in Windows Server 2012 R2
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2964729 You cannot stop the cluster service on a Windows Server 2012 R2-based failover cluster
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2964730 Storage spaces take a long time to move to another node after a node fails on a Windows Server 2012 R2 failover cluster
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2964814 Virtual machine network fails when you start the second VM on a Windows Server 2012 R2-based Hyper-V server
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2965074 Error occurs when you run Get-VirtualDisk|Get-ClusterResource cmdlet in Windows 8.1 or Windows Server 2012 R2
Like the previous update (may), this CU requires installed April CU
More info: http://support.microsoft.com/kb/2962409/en-us
TIP: read my post about May CU