Besides, Distributed Resource Scheduling (DRS) for Storage, Host-based replication for Site Recovery Manager, and Network I/O control for Virtual Machines, vSphere 5 will feature:
· Build on the vSphere ESXi hypervisor architecture
· vSphere Auto Deploy combining host profiles, Image Builder and PXE
· Unified CLI framework, allowing consistency of authentication, roles and auditing.
· Support for up to 1 TB of memory
· Support for 32 vCPU’s per VM
· Nonhardware accelerated 3D graphics for Windows Aero support
· USB 3.0 device support
· UEFI virtual BIOS

· Host EUFI boot support
· New GUI to configure multicore vCPUs
· Client-connected USB devices
· Smart card reader support for VMs
· Apple Mac OS X Server 10.6 (Snow Leopard) guest OS support
· Support for up to 512 VMs
· Support for up to 160 Logical CPUs and 2 TB or RAM
· Improved SNMP support
· Storage driven storage delivery based on the VMware-Aware Storage APIs
· Improved version of the Cluster File System, VMFS5
· Accelerator for specific use with View (VDI) workloads, providing a read cache optimized for recognizing, handling and deduplicating VDI client images.
· iSCSI user interface support
· Storage APIs – Array Integration: Thin Provisioning enabling reclaiming blocks of a thin provisioned LUN on the array when a virtual disk is deleted
· Swap to SSD
· 2TB+ LUN support
· Storage vMotion snapshot support
· vNetwork Distributed Switch improvements providing improved visibility in VM traffic
· ESXi Firewall protecting the ESXi 5.0 management interface
· A browser-based, fully-extensible, platform-independent implementation of the vSphere Client based on Adobe Flex.
· vCenter Server Appliance
· Inventory Extensibility: providing a manager to monitor partner extensions.
· vCenter Solutions Manager, providing a consistent interface to configure and monitor vCenter-integrated solutions developed by VMware and third parties.
· System message logging enhancements
· Revamped VMware High Availability (HA) with Fault Domain Manager
· All hosts in cluster can be primary nodes
· Cluster also uses shared storage as a channel for heartbeat detection
 
Quelle: http://virtualization.info/en/news/2011/04/more-details-about-vsphere-5-appear-online.html