VirtualBox 4 Beta on Solaris

Several beta releases of VirtualBox have been released in the last weeks. I had problems with the first two but beta 3 and later works nicely for me on Solaris 11 Express.

New features in 4.0

• New settings/disk file layout for VM portability; see the manual for more information.
• Open Virtualization Format Archive (OVA) support; see the manual for more information.
• VMM: support more than 1.5/2 GB guest RAM on 32-bit hosts
• Language bindings: uniform Java bindings for both local (COM/XPCOM) and remote (SOAP) invocation APIs
• Chipset: added support for the Intel ICH9 chipset with 3 PCI buses, PCI express and Message Signaled Interrupts (MSI)
• Audio: Intel HD Audio is now available as guest hardware, for better support with modern guest operating systems (e.g. 64-bit Windows; bug #2785).
• GUI: redesigned user interface with guest window preview
• GUI: new display mode with downscaled guest display
• Resource control: added support for limiting a VM's CPU time and IO bandwidth.
• Storage: support asynchronous I/O for iSCSI, VMDK, VHD and Parallels images
• Storage: support for resizing VDI and VHD images
• Windows Additions: support for automatically updating the Guest Additions (requires installed Windows Guest Additions 4.0 or later)
• Guest Additions: support for copying files into the guest file system

Update: Whats seems to be the release images are now available:
http://download.virtualbox.org/virtualbox/4.0.0