Maybe this will help someone: I updated to 10.8.2 via combo updater, but couldn't boot past the gray startup screen, because of OemSMBIOS.kext. After replacing AppleACPIPlatform.kext with the old one from a previous post in this (or an other) thread, my system booted without any problems.
Now, as I really don't like having legacy kexts on my system, I tried out various methods to allow me to keep the vanilla 10.8.2 AppleACPIPlatform.kext. The solution was quite easy and had a nice benefit to it. I installed Kozleks branch of FakeSMC + optional Kexts for sensors:https://github.com/kozlek/HWSensors
Not only can I now boot with the original 10.8.2 AppleACPIPlatform.kext, without having OemSMBIOS.kext throwing an error, but I also get much more information from my hardware sensors opposed to the original FlakeSMC-Plugins I had been using. Furthermore a serial number is generated for my machine (so no problems with iCloud and Appstore) and VT-d can stay enabled in BIOS!
Using the kexts from Kozlek was a win-win for me - thanks Kozlek!!!
This is great but sadly it did not work out for me