Looks like VI4 is on the horizon and coming soon, there is a beta out there at the moment for a select few, some new features include:

  • 64bit kernel and console operating system (COS)
  • clustered VirtualCenter Servers
  • ESX hosts profile management
  • cross-hosts virtual networking
  • 8-way virtual SMP
  • virtual machines fault tolerance across multiple hosts (the famous Continuous Availability presented last year)
  • VMs and media library
  • alarms on physical hardware faults
  • access control on storage resources
  • configuration change tracking
  • full support for SATA local storage

Read more information here