Finally it’s (almost) here! This new GSX version is absolutely cool and introduces so many features:
-) 3.6GB memory per virtual machine to support larger server applications
-) Teamed network adapter support, SCSI backup devices
-) 10-20% better disk and networking performance
-) Enhanced Management and Portability
-) VirtualCenter-based customization and provisioning of server images/configurations
-) Windows integration for performance monitoring and event logging of virtual machines
-) Automatic virtual machine start-up and shutdown
-) PXE provisioning for booting and installing operating systems into new virtual machines over the network
-) Ability to migrate virtual machines from GSX Server to datacenter-class ESX Server
Look at official announcement and first technical documents.