Oracle announced that VirtualBox4 Beta1 is available, this beta release and not advised to use it in a production machine, this release comes with major changes, 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, 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. Find more details in this Link.
If you want to test this beta release you can download the binaries packages from this Links:
- Ubuntu 10.10 Maverick and LinuxMint 10 Julia
- Fedora 14: