5. Hyper-V network virtualization
Can’t get enough Hyper-V? Want to let your virtualized environment communicate with its physical counterpart? Take a look at the gateways solutions: either private cloud or hybrid cloud
https://technet.microsoft.com/en-us/library/jj618319.aspx
4. Enhanced Linux integration services
Microsoft loves Linux! It has been said and here is more proof: more distributions and supported features than ever before
https://technet.microsoft.com/en-us/library/dn282278.aspx#bkmk_linux
3.Shared VHDX guest clustering
Forget about shared storage! Now you can have Virtual machines that share a VHD across multiple machines
http://www.aidanfinn.com/?p=14936
2.Multi-node Hyper-V replica
Introduced with Server 2012r2 Hyper-V replica allows a vendor independent (both workload and storage) solution for machine replication over IP networks. Here is a link to learn more
http://www.aidanfinn.com/?p=12147
And the number one reason to say goodbye to the old Server 2003 and Hello to the new Server 2012 r2 is…
1. Live Migration with RDMA
Use the power of Server 2012r2 to bypass the OS when transferring data. It drops latency and increases throughput. Here is a link to a build:
http://blogs.msdn.com/b/virtual_pc_guy/archive/2013/12/30/faster-live-migration-with-rdma-in-windows-server-2012-r2.aspx