Things must be a little hectic in NVIDIA's labs at the moment, The Inquirer report that they're having a few issues getting G80 ready for release in early November, though its most likely most of (if not all) problems will be delt with prior to the big launch day.
Check out the article here for the rundown on the current sitch.
NVIDIA IS GIVING out G80 cards to editors' day attendees but no real drivers. Why on earth would Nvidia need to do that?
What is broken? Well, it seems G80 has a lot broken, some that will be fixed before launch, and some may be harder to fix.
Drivers on the 25th October will fix SLI, as we understand it is pretty badly borked in the current release. How badly? Enough to crash almost every time, said one source, and so basically unusable.