Oracle’s VirtualBox 4.1.0 is now available for download and this is a major update version.what’s new in VirtualBox 4.1.0?
Support for cloning of VMs
Experimental support for PCI passthrough for Linux hosts
Experimental WDDM graphics driver, supporting Windows Aero and providing Direct3D support using a Guest
Experimental support for SATA hard disk hotplugging available with VBoxManagestatus of modules and
features can now be queried separately by the frontends
new network attachment mode Generic Driver
New Networking Mode UDP Tunnel
To know more check the changelog.