Looks tempting. I wonder exactly what level of support they have included for “Mac OS X guests”? It would be nice (but possibly illegal) if OS X guests were supported under Windows :)
All references to VirtualBox have been changed to ‘Oracle VirtualBox’ by Oracle with no impact to compatibility they say. Some of the most significant new features are considered “bleeding-edge,” like the experimental support for Mac OS X guests. Another cool feature is Memory Ballooning. This allows a Virtual Machine to dynamically increase or decrease the amount of RAM that it uses. This feature works only in 64-bit hosts.
OVB 3.2 also has new CPU hot-plugging features [ but only on Linux and Windows, Ed. ]