Windows Server 2012 R2 offers exciting new features and enhancements across virtualization, storage, networking, virtual desktop infrastructure, access and information protection, and more.
With Windows Azure VM and System Center 2012 R2, it unlocks improved application portability between on-premises environments and public and service provider clouds, increasing flexibility and elasticity of your IT services.
Windows Server 2012 R2 provides a scalable, highly available platform for mission-critical applications.
Windows Server 2012 R2 makes it easier to deploy a virtual desktop infrastructure, and can lower storage costs significantly by supporting a broad range of storage options and with a new feature VHD de-duplication.
Virtual Desktop Infrastructure in Windows Server 2012 R2 makes it possible for users to access IT from virtually anywhere, providing them a rich Windows experience while ensuring enhanced data security and compliance.
For more info and evaluation:
http://technet.microsoft.com/en-US/evalcenter/dn205292.aspx?CR_CC=200142594 (yet to be available)