Developer have produced VirtualBox-5.1.30 packages for testing available here. There have been difficulties building packages for VirtualBox-5.2.0 and there have been reports of a lot of last minute fixes and patches with that version. We probably won’t see VirtualBox 5.2 until 5.2.2 or 5.2.4 is released.
Please report any issues in this thread and file any bug reports here.