Last week Linux complained about the size of the kernel for this late into development of the Linux 3.8 kernel and this week it looks like the development tide is still rather high. "It still hasn't been as quiet as I'd have preferred."
As far as the kernel changes, Torvalds notes for Linux 3.8-rc7, "Mostly driver updates (usb, networking, radeon, regulator, sound) with a random smattering of other stuff (btrfs, networking, so on. And most everything is pretty small."
The release announcement for Linux 3.8-rc7 can be found on the Indiana LKML archive.
For those not up to speed on Linux 3.8, see The Feature Overview For The Linux 3.8 Kernel. There's also already a lot of features queuing up for Linux 3.9.