After a major release, it’s not surprising that a maintenance release follows hot on the heals, so VirtualBox 4.3.2 has been released. The downloads and changelog are in the usual places. The changes include a fix for the Mac OS X upgrade issue I mentioned recently.
PS. May have spoken too soon. The OS X version required back-to-back installations to get things working, but things were working fine after a reboot, so slightly better than the previous version.