I'm curious to understand why only Ivy Bridge CPUs are affected, especially if this is a software accounting/refcounting bug. Also, there was talk about this not being an 10.8.2 bug, but a result of an EFI firmware upgrade. Anyone have any insight?
By a quirk of how the updates were delivered, I have 10.8.2 on my Air, but the EFI firmware is still to be installed. VirtualBox is very dead (but I can't wait to get it going again!).