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