xHCI Controller to support USB 3 devices (requires the Extension Pack).Among others this includes: SSE 4.1, SSE4.2, AES-NI, POPCNT, RDRAND and RDSEED

Make more instruction set extensions available to the guest when running with hardware-assisted virtualization and nested paging.

Paravirtualization support for Windows and Linux guests to improve time-keeping accuracy and performance.

Incomplete list of changes, to be added to Virtualbox 5.0 stable: network settings) can now also be changed when the VM is in saved state

API: fix crashes in Java API clients using the XPCOM binding, happened with output parameters only.

API: fix information for some automatically generated events (only with XPCOM, Windows host was not affected), which caused errors when getting some of the attributes over the webservice.

API: mark VM configs with snapshots but without current snapshot as inaccessible, as this combination is nonsense.

API: block the removal of the current snapshot if it has child snapshots (only relevant for VMs without snapshottable hard disks, their presence always prevented removal), which resulted in VM config corruption.

Made resizing X11 guests work more reliably.

VBoxManage: when exporting an appliance, support the suppression of MAC addresses, which means they will be always recreated on import, avoiding duplicate MAC addresses for VMs which are imported several times.

VMM: improved timing on Solaris hosts with older VT-x hosts without preemption timers.

The latest version available is Virtualbox 5.0 Beta 1, which has been released with a huge list of changes. As you may know, Virtualbox is an free, multi-platform virtualization software created by Oracle, being popular on Linux, Windows and Mac OS X.

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