This has been a great new feature added in Windows Server 2012 R2. The possible scenario of the usage are Hyper-V failover cluster using Cluster Shared Volumes (CSV) on block-level storage or Hyper-V failover cluster using file-based storage in a separate Scale-Out File Server.

The below TechNet article details the usage and deployment options:
http://technet.microsoft.com/en-us/library/dn265980.aspx

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