Oracle delivered the first release candidate of VirtualBox 5.1 last week. The most significant revisions to the open source virtualization app are under the hood, and they add up to a better experience overall.
There hasn’t been a major, overarching change to the VirtualBox UI, thankfully. The graphical client now works with Qt5, to make better use of whatever native OS features are available, such as full-screen mode on MacOS 10.7.
