Linux kernel 3.8 RC6 comprises various x86 changes, some EFI improvements, and various other small bug fixes and stability improvements.
"I have to say, -rc6 is bigger than I'd like it to be. I'd really like things to calm down by rc6, because usually I aim for rc7 to be roughly the last rc in the series, and that means that I don't want to see hundreds of patches. But hundreds of patches it is. Not good."
"So I'm hoping that rc7 would be better quite quite on its own. But since I don't trust you sneaky bastards, I have a CleverPlan(tm) to make *sure* that rc7 will be better and much smaller. That plan largely depends on me being unreachable for the next week due to the fact that there is no internet under water," Linus Torvalds said in the official announcement.