Windows Server 2012 RC brings these capabilities:

  • Up to 320 Logical Processors Per Host
  • Up to 4 TB of Memory Per Host
  • Up to 64 Virtual CPU Per virtual machine
  • Up to 1 TB of memory per virtual machine
  • Up to 64 TB per virtual disk
  • Up to 255 virtual disks per VM for a maximum of up 16,320 TB (or 15.93 Petabytes) per virtual machine
  • Up to 64 nodes in a cluster
  • Up to 4000 VMs in a cluster

More information can be found at http://www.microsoft.com/en-us/server-cloud/windows-server/2012-server-virtualization.aspx.