In this blog post the author explains in detail some features of site-aware clustes feature that is coming in Windows Server 2016. It is always interesting for the Exchange Administrator to understand what is offered on the OS level and see if such features can be used by Exhange Server.
Windows Server 2016, debuts the birth of site-aware clusters. Nodes in stretched clusters can now be grouped based on their physical location (site). Cluster site-awareness enhances key operations during the cluster lifecycle such as failover behavior, placement policies, heartbeating between the nodes and quorum behavior. In the remainder of this blog I will explain how you can configure sites for your cluster, the notion of a “preferred site” and how site awareness manifests itself in your cluster operations.
Read more at source: http://blogs.msdn.com/b/clustering/archive/2015/08/19/10636304.aspx