Release Candidate 1 of VirtualBox 4.2 is now available for testing. This release is made available for testers and early adopters, and should not be used on production or critical systems.
Version 4.2 will be a major update and contains the following new features.
Improved Windows 8 support, in particular many 3D-related fixes
Ability to group virtual machines
Expert mode for wizards
Allow more settings to be modified while a guest is running
Support for up to 36 network cards
Limiting network IO bandwidth
Ability to start VMs during system boot on Linux, OS X and Solaris
New experimental support for Drag'n'drop from the host to Linux guests. Support for more guests and for guest-to-host is planned. (bug #81)
Host parallel port pass through on Windows platform
In addition to the new functionality, the following bugs have been fixed since the last beta release.
Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion
VMM: improved VM context switch performance for Intel CPUs using nested paging
VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer)
VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9; bug #9941)
VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. old OS/2 releases)
VMM: support recent VIA CPUs (bug #10005)
GUI: network operations manager
GUI: allow taking screenshots of the current VM window content
GUI: allow automatically sorting of the VM list
GUI: allow starting of headless VMs from the GUI
GUI: allow reset, shutdown and poweroff from the Manager window
GUI: allow to globally limit the maximum screen resolution for guests
GUI: show the full medium part on hovering the list of recently used ISO images
GUI: do not create additional folders when a new machine has a separator character in its name (bug #6541)
GUI: don't crash on terminate if the settings dialog is still open (bug #9973)
Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bug #10491)
Settings: sanitise the name of VM folders and settings file (bug #10549)
Settings: allow to store the iSCSI initiator secret encrypted
E1000: 802.1q VLAN support
Storage: implemented burning of audio CDs in passthrough mode
Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images
Storage: added support for QED images
Storage: added support for QCOW (full support for v1 and readonly support for v2 images)
Storage: added readonly support for VHDX images
Solaris additions: added support for X.org Server 1.11 and 1.12
Windows hosts: no need to recreate host-only adapters after a VirtualBox update
Windows hosts: updated toolchain; make the source code compatible to VC 2010 and enable some security-related compiler options
Please refer to the VirtualBox 4.2 Release Candidate 1 Changelog for a complete list of changes and enhancements.
Binaries for Windows, MacOS, Linux and Solaris can be downloaded here.
Important Note: Please do not use this VirtualBox Beta release on production machines.
A VirtualBox Release Candidate should be used for early evaluation and testing purposes.
Report problems or issues at the VirtualBox Beta Forum.