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Provisioning across datacenters—VirtualCenter 2.5 allows you to provision virtual machines across datacenters. As a result, VMware Infrastructure administrators can now clone a virtual machine on one datacenter to another datacenter.
Batch installation of VMware Tools—VirtualCenter 2.5 provides support for batch installations of VMware Tools so that VMware Tools can now be updated for selected groups of virtual machines.
VMware Storage VMotion—Storage VMotion allows IT administrators to minimize service disruption due to planned storage downtime previously incurred for rebalancing or retiring storage arrays. Storage VMotion simplifies array migration and upgrade tasks and reduces I/O bottlenecks by moving virtual machines to the best available storage resource in your environment.
VMware Consolidated Backup (VCB) enhancements—The VMware Consolidated Backup (VCB) framework has the following enhancements:

iSCSI Storage—The VCB framework now supports backing up of virtual machines directly from iSCSI storage. Previously, the VCB proxy was only supported with Fibre Channel SAN storage.
Integration in Converter—VMware Converter has the ability to restore virtual machine image backups created through the VCB framework. Now that Converter is integrated into VirtualCenter 2.5, you can perform image restores directly through the VI Client.

VMware Update Manager—Update Manager automates patch and update management for ESX Server hosts and select Microsoft and Linux virtual machines.
VMware High Availability enhancements—Enhanced high availability provides experimental support for monitoring individual virtual machine failures. VMware HA can now be set up to either restart the failed virtual machine or send a notification to the administrator.
Management of up to 200 hosts and 2000 virtual machines—VirtualCenter 2.5 can manage many more hosts and virtual machines than previous releases, scaling the manageability of the virtual datacenter to up to 200 hosts and 2000 virtual machines.
Large memory support for both ESX Server hosts and virtual machines—ESX Server 3.5 supports 256GB of physical memory and virtual machines with 64GB of RAM.
ESX Server host support for up to 32 logical processors— ESX Server 3.5 fully supports systems with up to 32 logical processors. Systems with up to 64 logical processors are supported experimentally.
SATA support—ESX Server 3.5 supports selected SATA devices connected to dual SAS/SATA controllers.
10 Gigabit Ethernet support—Neterion and NetXen 10 Gigabit Ethernet NIC cards are supported in ESX Server 3.5.