The third beta release of the upcoming VirtualBox 4.3 major update is now available.
VirtualBox 4.3 has brought interesting changes
for the Oracle virtualization software but now being later into its development cycle, the changes are less exciting.
VirtualBox 4.3 Beta 3 implements thread-context hooks for Linux/Solaris hosts, GUI changes, 3D support fixes for Windows 8.1, a Linux 3.11 kernel shared folders fix, and Linux 3.12 kernel fixes.
More details on the VirtualBox 4.3 Beta 3 changes can be found via the VirtualBox.org Forums